SSC Practice Test

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The ssc cgl syllabus is the single most important document any serious Combined Graduate Level aspirant should study before opening a textbook, downloading a PDF, or attempting a mock test. It defines exactly what the Staff Selection Commission will ask across Tier 1, Tier 2, and Tier 3, how those questions will be weighted, and which topics deserve daily attention versus a weekend brush-up. Treating the syllabus as a checklist rather than a vague suggestion separates candidates who clear cutoffs by ten marks from those who miss by two.

For the 2026 cycle, the syllabus continues the post-2022 pattern in which Tier 1 is a 60-minute objective screening, Tier 2 carries the bulk of the merit weight across three sessions including a mandatory data entry skill test, and Tier 3 is a descriptive paper used selectively for specific posts. Understanding which tier actually decides your rank is the first strategic decision, because over-investing in Tier 1 topics that no longer count toward the final merit is a common and costly mistake.

Tier 1 covers four sections of equal weight: General Intelligence and Reasoning, General Awareness, Quantitative Aptitude, and English Comprehension. Each section carries 50 marks across 25 questions, the paper runs 60 minutes total, and a negative marking penalty of 0.50 per wrong answer applies. The Commission has held this format stable for multiple cycles, which means previous year papers from 2022 through 2024 remain extremely reliable practice material for predicting question patterns.

Tier 2 is the real differentiator and where most candidates either build their lead or quietly lose the race. It is split into Paper 1 (compulsory for all posts), Paper 2 (Statistics, only for Junior Statistical Officer aspirants), and Paper 3 (General Studies Finance and Economics, only for Assistant Audit Officer and Assistant Accounts Officer aspirants). Paper 1 itself has three sessions across two days, including objective sections, a typing test, and a computer proficiency module.

Most aspirants underestimate how much the syllabus rewards depth over breadth. Quantitative Aptitude in Tier 2, for example, asks fewer trick questions and more direct computation-heavy problems where speed and accuracy matter more than exotic shortcuts. Similarly, English in Tier 2 weighs reading comprehension, cloze tests, and error spotting much more than vocabulary trivia. Reading the official syllabus PDF line by line, mapping each topic to a chapter in your study material, and building a topic-level scorecard is the cleanest way to start.

Before you commit to a six-month plan, take an honest diagnostic mock under timed conditions. Your section-wise scores will tell you which parts of the syllabus need foundational rebuilding versus which only need revision. Many candidates discover their reasoning is already at 80 percent accuracy while their general awareness sits below 40 percent โ€” and the syllabus is the map that tells you exactly which sub-topics in GA are likely to plug that gap fastest.

For schedule details, check the official SSC CGL Exam Date 2025: Complete Schedule, Tier-Wise Timeline, Admit Card Release, and Smart Preparation Roadmap to align your prep window with realistic tier dates.

This guide breaks down every section of the ssc cgl syllabus, the exact marking scheme, weightage analysis from previous papers, a tier-wise study schedule, recommended resources, and the common syllabus-related mistakes that quietly cost candidates their final selection. Bookmark it, print the topic tables, and revisit them every two weeks.

SSC CGL Syllabus by the Numbers

๐Ÿ“‹
100
Tier 1 Questions
โฑ๏ธ
60 min
Tier 1 Duration
๐Ÿ“Š
450
Tier 2 Paper 1 Marks
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0.50
Tier 1 Negative Mark
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3
Tiers Total
๐Ÿ“š
7
Major Subjects
Practice SSC CGL Syllabus Questions Now

Tier 1 of the ssc cgl syllabus is a balanced four-section paper, and the Commission has been remarkably consistent in honoring the published topic list. General Intelligence and Reasoning covers analogies, classification, series, coding-decoding, blood relations, direction sense, syllogisms, statement-conclusion, Venn diagrams, mirror and water images, paper folding and cutting, embedded figures, and a small set of non-verbal pattern questions. Around 18 of the 25 questions are verbal reasoning and the rest are non-verbal, so spending 70 percent of reasoning prep on verbal types is statistically sound.

General Awareness is the most volatile section because it pulls from history, geography, polity, economics, general science (physics, chemistry, biology), static GK, sports, awards, books and authors, and current affairs from roughly the last six to eight months before the exam. The trick is that SSC favors NCERT-anchored static questions over deep current affairs, so candidates who master Class 6 to 10 NCERT highlights often outscore those who only mug last month's news. Plan for at least 60 percent static and 40 percent current affairs coverage.

Quantitative Aptitude tests arithmetic (percentages, profit and loss, ratio, average, time and work, time speed distance, simple and compound interest, mixtures), algebra (linear and quadratic equations, polynomials, identities), geometry (triangles, circles, quadrilaterals, coordinate geometry basics), mensuration (2D and 3D), trigonometry (heights and distances, identities), and data interpretation (bar graphs, pie charts, tables, line graphs). The 25-question split typically favors arithmetic, with roughly 12 to 14 questions from arithmetic alone, making it the highest-ROI cluster.

English Comprehension covers synonyms and antonyms, idioms and phrases, one-word substitutions, spotting errors, sentence improvement, active and passive voice, direct and indirect speech, cloze tests, para jumbles, fill in the blanks, and a short reading comprehension passage. The section is more vocabulary-driven than Tier 2 English, and candidates who maintain a 25-word-a-day vocabulary diary for three months usually see their score jump by 10 to 14 marks compared to those who only practice grammar drills.

The marking scheme in Tier 1 is straightforward: plus 2 for every correct answer and minus 0.50 for every wrong answer. There is no sectional cutoff at Tier 1, only an overall cutoff that varies by category and post. This means strategic skipping matters enormously. If you are guessing between two options on a question, the expected value of attempting is positive only when your confidence exceeds about 33 percent; on pure blind guesses, the math works against you, so disciplined non-attempts protect your score.

One often-overlooked subtlety: Tier 1 is now purely qualifying for many posts in the sense that final merit is built almost entirely on Tier 2 scores. However, you must still clear the Tier 1 cutoff to be eligible for Tier 2 evaluation, so treating it as unimportant is dangerous.

The smart framing is: clear Tier 1 comfortably with a 30 to 40 mark margin above expected cutoff, but invest the bulk of your preparation time in Tier 2 topics where the actual ranking is decided. For background on the commission itself, see SSC Meaning: Staff Selection Commission, Exam Types, Eligibility, and How to Crack Government Jobs.

Finally, remember that Tier 1 has no section timer. You can spend 25 minutes on Quantitative Aptitude and only 8 minutes on General Awareness if that maximizes your score. Build your personal time allocation through mock tests, not by copying someone else's plan, because section strengths vary wildly between candidates with different academic backgrounds.

SSC Computer Knowledge
Tier 2 Module 3 practice covering MS Office, internet basics, and computer fundamentals.
SSC Computer Knowledge 2
Advanced computer knowledge drills aligned with the SSC CGL Tier 2 syllabus.

Tier 2 Paper-Wise Breakdown

๐Ÿ“‹ Paper 1 (Compulsory)

Paper 1 is mandatory for every CGL post and runs across three sessions. Session 1 contains Section 1 (Mathematical Abilities and Reasoning, 60 questions, 180 marks) and Section 2 (English Language and Comprehension plus General Awareness, 70 questions, 210 marks), totaling 130 questions in 2 hours 15 minutes. Negative marking is one full mark per wrong answer, which is double the Tier 1 penalty, so accuracy management matters far more here than in the screening tier.

Session 2 of Paper 1 is the Computer Knowledge Module: 20 objective questions in 15 minutes, qualifying in nature, focused on operating systems, MS Word, Excel, PowerPoint, internet and email basics, and cybersecurity awareness. Session 3 is the Data Entry Skill Test, a typing test of approximately 2000 key depressions in 15 minutes, also qualifying. Skipping practice for these qualifying modules is a frequent and avoidable cause of disqualification despite strong objective scores.

๐Ÿ“‹ Paper 2 (Statistics)

Paper 2 is only attempted by candidates applying for the Junior Statistical Officer post in the Ministry of Statistics. It carries 200 marks across 100 questions in 2 hours with one mark negative per wrong answer. The syllabus covers collection, classification and presentation of statistical data, measures of central tendency, dispersion, moments and skewness, correlation and regression, probability theory, random variables, sampling theory, statistical inference, analysis of variance, time series, and index numbers.

While the topic list looks intimidating, the questions are largely formula-driven and reward candidates with a strong statistics or mathematics undergraduate background. If you studied statistics in your bachelor's program, Paper 2 is often a high-scoring opportunity that can dramatically boost merit rank. Aspirants from non-statistics backgrounds should think carefully about whether the additional preparation load is justified given the limited number of JSO vacancies each cycle.

๐Ÿ“‹ Paper 3 (Finance & Economics)

Paper 3 is for Assistant Audit Officer and Assistant Accounts Officer aspirants and carries 200 marks across 100 questions in 2 hours. Part A is Finance and Accounts (80 marks): fundamental principles, financial accounting, basic accounting concepts, journal, ledger, trial balance, rectification of errors, depreciation, and final accounts. Part B is Economics and Governance (120 marks): comptroller and auditor general, finance commission, theory of demand and supply, production and cost, market forms, Indian economy, money and banking, and budgeting.

Paper 3 is decisive for AAO and AAAO aspirants because final merit for these prestigious posts factors in this score heavily. Commerce graduates have a natural advantage in Part A, while economics or political science graduates handle Part B more comfortably. Mixed-background candidates should plan a dedicated three-month preparation block specifically for Paper 3 alongside Paper 1, not as an afterthought.

Studying the Full Syllabus vs. Selective Topic Focus

Pros

  • Complete syllabus coverage protects you from surprise high-weightage topics in any given year
  • Reduces test-day anxiety because no section feels like an unknown
  • Builds transferable skills useful for SSC CHSL, MTS, and other government exams
  • Allows you to attempt all questions confidently rather than skipping entire topics
  • Improves your average across multiple mocks, smoothing out lucky or unlucky paper days
  • Makes Tier 2 transition easier because foundations are already in place

Cons

  • Requires 8 to 10 months of disciplined daily preparation, which is hard with a job
  • Risk of shallow coverage where you know every topic but master none
  • Time spent on low-weightage topics could be reinvested in arithmetic and English
  • Burnout is higher when chasing perfection across all four sections
  • Revision becomes harder because there is simply more material to keep fresh
  • May delay your first attempt by a full cycle, costing a year of potential service
SSC Computer Knowledge 3
Third set of computer knowledge questions covering shortcuts, networking, and security basics.
SSC English Language & Comprehension
Tier 1 and Tier 2 English drills on grammar, vocabulary, and reading comprehension.

SSC CGL Syllabus Coverage Checklist

Download the official SSC CGL notification PDF and bookmark the syllabus pages
Map every Tier 1 topic to a specific chapter in your chosen study material
Build a topic-level tracker with status: not started, in progress, revised, mastered
Cover NCERT Class 6 to 10 science and social science for General Awareness foundation
Solve at least 10 previous year papers from 2018 to 2024 under timed conditions
Maintain a daily current affairs notebook for the six months before the exam
Practice 30 minutes of mental math daily to build Quantitative Aptitude speed
Read one editorial column daily to build English vocabulary and comprehension
Attempt at least one full-length Tier 1 mock test every week starting month three
Schedule dedicated Tier 2 preparation blocks for Mathematical Abilities and English
Practice typing at 30+ words per minute for the Data Entry Skill Test module
Revise the entire syllabus three times before your final mock test
Tier 2 weightage decides your post โ€” not Tier 1.

For most CGL posts, final merit is built on Tier 2 marks while Tier 1 only acts as a qualifying gate. Aspirants who realize this in month one and front-load Tier 2 preparation routinely outrank those who spend six months perfecting Tier 1 reasoning. Audit your time allocation: at least 55 percent of your study hours should be on Tier 2 topics.

Weightage analysis from previous year papers gives you the second most powerful study tool after the syllabus itself. In Quantitative Aptitude Tier 1, arithmetic consistently delivers 12 to 14 questions out of 25, geometry and mensuration together contribute 5 to 6, algebra 3 to 4, trigonometry 2 to 3, and data interpretation 2 to 3. This distribution has barely shifted in five years. A candidate who masters arithmetic to 90 percent accuracy can score 24 to 28 marks in QA alone without touching exotic algebra topics, which is enough to clear most general category cutoffs.

In General Intelligence and Reasoning, verbal reasoning dominates: analogies, classification, series, and coding-decoding together account for 10 to 12 questions, while syllogism, blood relations, and direction sense add another 4 to 5. Non-verbal pattern recognition contributes about 4 to 6 questions and is the easiest to master because patterns repeat across papers. A focused 21-day non-verbal sprint usually moves candidates from 60 percent to 90 percent accuracy in that sub-section.

General Awareness weightage is the most discussed and least predictable. However, history (5 to 7 questions, with ancient and medieval Indian history slightly favored), polity (3 to 5 questions on the Constitution and governance), geography (3 to 4 questions on Indian and world physical geography), economics (2 to 3 questions on basic concepts), and general science (8 to 10 questions split across physics, chemistry, and biology) form the bulk. Sports, awards, and books contribute the remaining 3 to 5 questions and reward last-month current affairs revision.

English Comprehension weightage is grammar-heavy: spotting errors and sentence improvement together give 6 to 8 questions, fill in the blanks and cloze test 4 to 5, synonyms and antonyms 4 to 6, idioms and one-word substitutions 4 to 5, and a single reading comprehension passage with 3 to 5 questions. Notice that synonyms, antonyms, and one-word substitutions alone account for nearly a third of the section, which is why building a 1500-word vocabulary list is a high-leverage activity.

Tier 2 Paper 1 weightage looks different. Mathematical Abilities asks harder arithmetic, more algebra, and significantly more advanced data interpretation than Tier 1. English Language and Comprehension shifts heavily toward reading comprehension, with three to four passages contributing 15 to 20 questions out of 45. General Awareness questions in Tier 2 are deeper and reward candidates who actually read NCERT books cover to cover rather than relying on one-line GK compilations.

One important strategic insight: priority is not the same as weightage. A topic might carry only 2 questions but be extremely high-priority if your accuracy on it is currently zero and the effort to learn it is small. Coordinate geometry basics in QA, for example, contribute just 1 to 2 questions but can be mastered in two focused study sessions. Conversely, advanced trigonometry identities can swallow 30 hours of preparation for the same 2-question return. Always ask: marks per hour invested, not marks alone.

Use a simple two-axis matrix to prioritize: high weightage and low current accuracy goes on your daily study list, low weightage and high effort gets parked, low weightage and low effort becomes a weekend filler, and high weightage and high current accuracy moves into weekly maintenance revision only. This matrix will save you 200 to 300 hours of misallocated study time across a 6-month preparation cycle.

A smart study roadmap for the ssc cgl syllabus depends on your starting point, available daily hours, and target post. Three realistic profiles cover most aspirants: the fresh graduate with 8 to 10 study hours daily, the working professional with 3 to 4 study hours, and the repeat aspirant with strong basics needing only revision and mock-test discipline. The total syllabus is the same; the timeline and intensity differ dramatically.

For a fresh graduate starting from scratch, an 8-month plan works well. Months 1 and 2 build foundations: NCERT-based GA, arithmetic basics, grammar fundamentals, and verbal reasoning. Months 3 and 4 cover the rest of the Tier 1 syllabus while introducing Tier 2 difficulty in math and English. Months 5 and 6 are dedicated mock test cycles for Tier 1 with weekly sectional tests. Months 7 and 8 pivot fully to Tier 2 preparation, with daily descriptive writing practice if Tier 3 is in your post list.

Working professionals should compress this into a 10-month plan instead of attempting an 8-month timeline at half the hours. Weekday sessions of 3 to 4 hours focus on one section per day (rotation: QA Monday, Reasoning Tuesday, English Wednesday, GA Thursday, mock Friday). Weekends absorb the bulk of revision and full-length mocks. The risk for this group is mock test fatigue in months 8 and 9; build in two recovery weeks of light revision only, no new topics, no full-length tests.

Repeat aspirants who have already attempted CGL once should resist the urge to restart from chapter one. Instead, take three full-length Tier 1 mocks under timed conditions in the first week, identify the four to five weakest topics across all sections, and design a 12-week targeted improvement plan around those weaknesses only. Pair this with weekly Tier 2 mocks from week three onward. This approach typically lifts repeat-aspirant scores by 25 to 40 marks compared to a generic restart.

Resource selection matters as much as schedule. For Quantitative Aptitude, Rakesh Yadav class notes and Kiran Publication previous year papers remain the gold standard. For Reasoning, M.K. Pandey and previous papers cover the topic completely. For English, Wren and Martin grammar paired with Norman Lewis vocabulary builds the foundation, supplemented by daily editorial reading from The Hindu or Indian Express. For General Awareness, Lucent's GK book plus a monthly current affairs magazine works for most candidates.

Test-taking strategy deserves equal preparation time. Decide in advance the order in which you will attempt sections in Tier 1: most candidates do well starting with General Awareness (10 minutes), then English (15 minutes), then Reasoning (15 minutes), then Quantitative Aptitude (20 minutes). This puts your slowest section last when you have maximum context and removes the panic of running out of time on QA. Practice this exact sequence in every full-length mock so it becomes automatic on exam day. Bookmark the SSC.gov.in: Staff Selection Commission Official Website Guide for notification updates.

Finally, build a revision calendar that is non-negotiable. Every topic you study should be revised after 1 day, 7 days, 21 days, and 60 days. This spaced-repetition schedule prevents the common scenario where candidates complete the syllabus in month 4 and then forget half of it by month 7. A simple spreadsheet with topic name, first-study date, and four revision-date columns is enough; you don't need an app.

Take a Full SSC CGL Syllabus Mock Test

Practical execution is where most well-built study plans collapse. The single biggest predictor of final selection is not IQ, study material, or even total hours โ€” it is consistency across weeks. A candidate studying 4 disciplined hours daily for 8 months will almost always outscore a candidate who alternates 10-hour weekdays with 2-hour weekends, because the second pattern destroys the spaced-repetition revision cycle that turns short-term memory into exam-ready recall. Build a schedule you can sustain, not one that impresses you on paper.

Mock test analysis matters more than mock test attempts. Every full-length mock should be followed by a 90-minute review session where you categorize each wrong answer: was it a knowledge gap, a calculation error, a misread question, a time-pressure mistake, or a guessing error? Track these categories across 20 mocks and you will see clear patterns. Most candidates discover that 40 to 50 percent of their wrong answers are not knowledge gaps at all โ€” they are recoverable through better test-taking habits, not more studying.

Time management within sections needs deliberate practice. In QA, set a personal limit of 90 seconds per question on average; any question still unsolved at 90 seconds gets flagged and skipped. You can return to flagged questions in the final 10 minutes of the paper. This discipline alone typically adds 4 to 6 questions worth of attempts because it prevents the death-spiral of spending 5 minutes on one hard arithmetic problem you would have gotten wrong anyway.

Health and sleep are syllabus topics in disguise. The candidates who score in the top 5 percent on Tier 1 are not the ones who studied until 2 AM the week before the exam; they are the ones who held a consistent 7-hour sleep schedule, walked 30 minutes daily, and avoided caffeine spikes that crashed their afternoon focus. Treat your body like your second study tool. A tired brain reads questions wrong on Tier 2, and a single misread comprehension question in English costs 4 marks (3 lost plus 1 negative) โ€” equivalent to two correct arithmetic questions.

Exam-day logistics deserve a checklist of their own. Visit your exam center location the day before to confirm the route and travel time. Carry two printed admit cards, original photo ID, and the required photographs. Reach the center at least 90 minutes before reporting time because biometric verification and frisking queues can take 30 to 45 minutes. Eat a light breakfast that you have eaten before โ€” exam day is not the time to experiment with a new energy bar. Many candidates lose 5 to 10 minutes of effective test time due to digestive discomfort caused by unfamiliar food.

During the test, the first 30 seconds are critical. Skim the General Awareness section first to confirm no shock topics appear, then start your planned sequence. If a question in any section feels unusually hard, flag it within 20 seconds and move on. The paper rewards calm pacing far more than aggressive attempting. Aspirants who attempt 90 questions with 85 percent accuracy almost always outscore those who attempt all 100 with 70 percent accuracy because of the negative marking math.

Finally, treat the post-Tier 1 result period as active preparation time, not a vacation. Tier 2 is announced quickly and most candidates clear Tier 1 with only a 30 to 45 day gap before Tier 2. Use the gap for daily Tier 2 mocks, descriptive writing if applicable, typing practice for the DEST module, and brushing up on Computer Knowledge for the qualifying module. The candidates who quietly prepare during the result-waiting weeks are the ones who walk into Tier 2 confident rather than scrambling.

SSC English Language & Comprehension 2
Second set of English drills targeting Tier 2 reading comprehension, cloze, and error spotting.
SSC English Language & Comprehension 3
Advanced English practice covering vocabulary, sentence improvement, and para jumbles.

SSC Questions and Answers

Has the SSC CGL syllabus changed for 2026?

The core syllabus structure introduced in the 2022 revision continues for 2026. Tier 1 remains four sections of 25 questions each, Tier 2 Paper 1 retains its three-session format with computer knowledge and typing modules, and Papers 2 and 3 are unchanged for JSO and AAO candidates respectively. Always cross-check the official notification PDF for any subtle topic additions when it is released by the Commission.

Which section in Tier 1 has the highest weightage?

All four Tier 1 sections carry equal weight at 50 marks each, but Quantitative Aptitude and General Awareness are typically the highest-scoring sections for prepared candidates. QA rewards consistent practice and GA rewards NCERT-anchored study. Reasoning is the most predictable and English is the most vocabulary-dependent. Strategically, candidates should aim for at least 40 marks in QA and Reasoning each and 35+ in GA and English.

Is Tier 3 mandatory for all SSC CGL posts?

No. Tier 3 is a descriptive paper involving essay, precis, letter, or application writing in English or Hindi for 100 marks in 60 minutes. It is required only for specific posts such as Statistical Investigator Grade II, Compiler, and a few others. Most CGL candidates targeting Income Tax Inspector, Assistant Section Officer, or Sub Inspector posts do not need to clear Tier 3. Confirm requirements from the official post-wise notification.

How much negative marking is there in each tier?

Tier 1 has 0.50 marks deducted for each wrong answer across all four sections. Tier 2 Paper 1 has 1.00 mark deducted per wrong answer in the objective sections, which is double the Tier 1 penalty. Papers 2 and 3 also follow the 1.00 mark negative scheme. The Computer Knowledge module and Data Entry Skill Test in Tier 2 are qualifying and do not carry negative marking but must be passed to qualify.

What is the minimum qualifying mark in each tier?

For Unreserved candidates the qualifying mark is typically 30 percent, for OBC and EWS it is 25 percent, and for SC, ST, and PwBD it is 20 percent. However, the actual cutoff for selection is much higher and varies by post and category. Recent UR cutoffs for Tier 1 have ranged between 130 and 160 marks out of 200. Always aim for at least 30 marks above the previous year cutoff to be safe.

Can I skip the General Awareness section if I'm strong in other sections?

Strategically no, because there is no sectional cutoff but a strong GA score is one of the cheapest ways to add 30 to 40 marks. Even 30 days of focused NCERT-based GA preparation can lift you from 15 marks to 35 marks in the section. Skipping GA entirely forces you to compensate with near-perfect scores in QA, Reasoning, and English, which is much harder than scoring moderately well across all four sections.

Which book is best for SSC CGL syllabus preparation?

No single book covers everything well. For QA, Rakesh Yadav class notes and Kiran's previous year papers compilation work best. For Reasoning, M.K. Pandey is the standard. For English, combine Wren and Martin grammar with Norman Lewis vocabulary and daily editorial reading. For GA, Lucent's General Knowledge plus a current affairs monthly magazine covers most needs. Avoid switching between five books for the same topic; pick one and master it.

How long does it take to complete the SSC CGL syllabus?

For a fresh graduate studying 8 to 10 hours daily, full syllabus coverage with revision and mocks takes about 8 months. For a working professional with 3 to 4 hours daily, plan for 10 to 12 months. Repeat aspirants with strong basics often need only 4 to 5 months of targeted weakness improvement. The syllabus itself is finite; the variable is your daily input and revision discipline, not the topic count.

Is the Tier 2 typing test difficult to clear?

The Data Entry Skill Test requires approximately 2000 key depressions in 15 minutes, which works out to roughly 27 to 30 words per minute with reasonable accuracy. Most candidates who practice typing for 30 minutes daily for two months easily clear this threshold. It is qualifying only, but failing it disqualifies your entire candidature regardless of objective scores, so treat it as non-optional preparation.

Where can I download the official SSC CGL syllabus PDF?

The official syllabus is published as part of the annual SSC CGL notification on the Staff Selection Commission's official website. Look for the notification PDF under the Notice section. The detailed syllabus appears in Annexure-I or similar appendices, typically running 10 to 15 pages. Always rely on this official document rather than coaching institute summaries, because subtle topic additions sometimes appear only in the official version.
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