The IAR (Illinois Assessment of Readiness) is Illinois's official state standardized test for students in grades 3 through 8, measuring proficiency in English Language Arts and Mathematics aligned to the Illinois Learning Standards. This guide explains what the IAR practice test covers, how the test is structured by grade and subject, what performance levels mean, and how students can prepare effectively for the spring testing window.
The Illinois Assessment of Readiness (IAR) is the state-mandated standardized assessment administered by the Illinois State Board of Education (ISBE) each spring. It replaced the PARCC assessment beginning in the 2018–19 school year and evaluates student mastery of the Illinois Learning Standards — an adaptation of the Common Core State Standards. The IAR is computer-based and proctored through the ISBE testing platform at participating public schools.
The assessment covers two core subjects: English Language Arts (ELA) and Mathematics. Both assessments are taken annually by all students in grades 3 through 8. Because the IAR is directly aligned to the Illinois Learning Standards, it functions as a key measure of academic progress and school accountability across the state.
For targeted IAR practice test questions aligned to grade-level standards, our IAR question bank covers both ELA and math across all tested grades. Students and families can access Illinois assessment practice tests to build familiarity with the question format before the spring testing window opens.
All students enrolled in Illinois public schools in grades 3 through 8 are required to take the IAR each spring. This includes students receiving special education services, English Language Learners (with appropriate accommodations), and students in public charter schools. Private and parochial schools are not required to participate.
The IAR is taken once per school year during a designated testing window that typically runs from March through May. The exact testing dates are set by each district within the statewide window established by ISBE. Schools proctor the assessment in a controlled, computer-based environment.
Grade-specific content expectations mean that third graders encounter foundational reading and narrative writing tasks, while eighth graders face literary analysis, argument writing, and algebra-level math. This progression makes consistent annual preparation important — skills built in earlier grades directly support performance in later grades. Students can start building those skills now with our IAR practice questions organized by grade band.
The IAR English Language Arts assessment consists of literary and informational text passages paired with a range of question types designed to measure close reading and written communication skills.
Evidence-Based Selected Response (EBSR): The EBSR is the signature question type of the IAR — a two-part item unique to this assessment. Part A asks a comprehension or inference question about the passage. Part B asks students to select a quote or detail from the text that best supports their Part A answer. Both parts must be correct to receive full credit. Practicing this two-part format specifically is one of the most effective IAR prep strategies.
Technology-Enhanced Items (TEIs): These computer-based items require students to interact with content — dragging text into categories, highlighting evidence in a passage, ordering events in a sequence, or completing tables. TEIs test the same skills as traditional multiple choice but require more active engagement with the text.
Written Expression Task: Each ELA assessment includes an extended written response. Students read a prompt connected to the passage(s) and produce a full written response — narrative, informational, or argumentative depending on the grade. Responses are scored on content, organization, language use, and conventions.
Grade band content focuses include: grades 3–5 (foundational reading comprehension, narrative writing, text structure); grades 6–8 (literary analysis, argument writing, synthesis across multiple texts).
The IAR Mathematics assessment is organized into three units with different calculator policies, reflecting the Illinois Learning Standards emphasis on both computational fluency and mathematical reasoning.
Unit 1 — No Calculator: Tests arithmetic fluency, number sense, and operations that students are expected to perform without a calculator. This unit typically includes grade-level computation with fractions, decimals, integers, and basic algebraic expressions depending on the grade.
Unit 2 — Calculator Permitted: Focuses on application, problem-solving, and higher-order mathematical reasoning. Students may use a calculator (typically provided digitally within the testing platform) for multi-step problems involving measurement, data, geometry, and more complex algebra at grades 6–8.
Unit 3 — Calculator Permitted: Continues with calculator-accessible items covering remaining grade-level standards. The split between Units 2 and 3 reflects the test's length management rather than distinct content categories.
Grade-band math content includes: grades 3–5 (operations with whole numbers and fractions, place value, measurement, introductory geometry); grades 6–8 (ratios, proportional relationships, expressions and equations, geometry, statistics, and 8th-grade functions and linear equations).
All IAR math units include a mix of multiple choice, multi-select, drag-and-drop, gridded response, and short answer items. Getting familiar with these formats through IAR exam prep resources — especially the calculator boundary — is an important part of readiness. You can also explore our full set of Illinois assessment practice tests organized by grade and topic.
The IAR replaced PARCC in Illinois beginning with the 2018–19 school year. The two assessments share a very similar question format — including EBSR two-part items, technology-enhanced items, and the same three-unit math structure. This means that released PARCC practice materials remain useful for IAR preparation, as the question style and skills tested are closely aligned. ISBE also releases official IAR practice materials at no cost through isbe.net, which are the most current and directly aligned resources available. For additional IAR practice test questions in both ELA and math, visit our IAR question bank.
The IAR uses a five-level performance framework to describe what a student's score means relative to grade-level expectations:
Individual student score reports are provided to families by their school district, typically during the summer following the spring test administration. Reports include the student's scale score, performance level, and comparison to state averages. Districts may also share reports through parent portals.
For practice aligned to the IAR's question difficulty at each performance level, explore our IAR exam prep video walkthroughs and our IAR practice test question bank with detailed explanations.