The HESI A2 — Health Education Systems Incorporated Admission Assessment — is a standardized test used by hundreds of nursing and allied health programs to evaluate whether applicants are ready for the academic demands of their programs. It's not a licensing exam. It doesn't certify you to practice nursing. It's an admissions tool — schools use it to compare applicants and predict who's likely to succeed in the program.
There's also the HESI Exit Exam, which is a separate test used at the end of nursing school to predict NCLEX performance. If you're applying to nursing school, you need the HESI A2. If you're finishing nursing school, you need the Exit Exam. They're published by the same company (Elsevier) but serve completely different purposes — confusing them causes candidates to prepare for the wrong thing.
The HESI A2 covers up to eight content areas: Mathematics, Reading Comprehension, Vocabulary, Grammar, Biology, Chemistry, Anatomy and Physiology, and Physics. Schools don't all require every section — many require only five or six of the eight. Before you register, check with your specific nursing program to find out which sections they require and what minimum score they expect on each one. Studying sections your school doesn't require wastes time that could go toward the sections they do.
You can access a HESI practice test to gauge your current level before committing to a full study plan. Knowing where you're starting from — which sections need the most work, which you're already reasonably strong in — is the most efficient way to allocate your prep time. Most programs report the HESI is moderately difficult; strong preparation is the clearest predictor of a good score.
One more thing to clarify before diving in: "HESI" refers to the testing company. The actual exam you'll likely take is the HESI A2 — "A2" standing for Admission Assessment, second edition. You'll see these terms used interchangeably in nursing school discussions, admissions materials, and prep resources. When someone says "take the HESI," they almost always mean the HESI A2 admissions exam, not the Exit Exam or any other product in the HESI line.
The Mathematics section covers fractions, decimals, percentages, ratios, basic algebra, and dosage calculations. A calculator is provided for this section, but knowing how to set up the problem correctly matters more than raw computation speed. Medication dosage calculation questions — the kind that appear directly in nursing practice — make up a notable portion of the math section. Nursing students who struggle with dosage math in clinical rotations often trace it back to weak HESI math preparation.
Reading Comprehension presents passages followed by questions testing literal comprehension, implied meaning, and logical inference. The passages often cover health-related topics, which helps nursing school applicants feel at home — but the question format demands careful reading, not just familiarity with the subject. Rushing through passages to save time is a common mistake; the questions are specific enough that surface reading leads to errors.
Vocabulary in the HESI context is medical and academic vocabulary — not everyday language. Terms like "exacerbate," "contraindicated," "perfuse," and "attenuate" appear regularly. Medical terminology isn't tested explicitly (that's not a separate section), but vocabulary with clinical relevance is common. A dedicated week of medical vocabulary flashcard review typically produces measurable improvement in this section. The HESI A2 practice test questions include vocabulary items representative of what appears on the real exam.
The science sections — Biology, Chemistry, A&P, and Physics — test content knowledge, not just reasoning. For Biology, expect cell structure, genetics, ecology basics, and biological processes. Chemistry covers atomic structure, periodic table, bonding, and reactions. Anatomy and Physiology is the most directly nursing-relevant science section: organ systems, physiological processes, anatomical terminology. Physics — required by fewer programs — covers mechanics, thermodynamics, and optics. If your program requires Physics, give it dedicated study time; it's easy to underestimate based on how rarely it appears in nursing school itself.
The depth of science knowledge tested is roughly equivalent to an introductory college course. You don't need graduate-level expertise in any section. But surface-level familiarity — knowing a term without understanding the concept — won't hold up against the scenario-based questions the HESI uses. For A&P especially, understanding how body systems work together matters more than memorizing isolated definitions. Studying the cardiovascular system means knowing how heart rate, blood pressure, and cardiac output interact — not just what the heart is.
Key Topics:
Study tip: Practice dosage calculations daily — they appear frequently and require setup accuracy, not just arithmetic.
Reading Comprehension topics:
Vocabulary focus: Medical and academic vocabulary — terms like "exacerbate," "contraindicated," "perfuse." Use flashcards with spaced repetition. Aim for 20–30 new terms per day.
Key Grammar Topics:
Study tip: Review grammar rules then practice application — recognizing errors in context is different from knowing the rule abstractly.
Biology: Cell structure, genetics, ecosystems, photosynthesis, respiration
Chemistry: Atomic structure, periodic table, bonding, reactions, solutions
Anatomy & Physiology: All major organ systems — cardiovascular, respiratory, nervous, endocrine, renal, musculoskeletal. Most RN programs require A&P.
Physics: Forces, thermodynamics, optics, waves. Required by fewer programs — confirm before allocating study time.
The most common mistake in HESI preparation is studying everything equally rather than prioritizing weak areas. After taking an initial practice test, you'll have a section-by-section performance snapshot. If you're scoring 85% on Vocabulary but 62% on Mathematics, putting equal time into both is inefficient. Mathematics should get two to three times the study time until your practice scores are consistently above your program's minimum threshold on that section.
Timed practice matters more than untimed review. The HESI is moderately long — up to six hours for all sections — and mental fatigue is a real factor in later sections. Students who practice in short sessions without time pressure often underperform on test day because they haven't built the concentration stamina the full exam requires. Simulating real exam conditions at least once during your preparation gives you a realistic calibration of where you actually stand.
For the science sections, active recall outperforms passive review. Making flashcards, explaining concepts out loud, or writing explanations from memory — rather than simply re-reading notes — produces significantly better retention for anatomy, biology, and chemistry content. Spaced repetition apps like Anki work well for the vocabulary section specifically; they automate the timing of when to review each card based on how well you're retaining it. Use your hesi a2 exam registration preparation resources to structure review across all required sections rather than defaulting to only the ones you find most comfortable.
Practice test scores tend to plateau if you keep using the same questions. Vary your practice sources — official Elsevier materials, reputable online banks, and physical prep books — to encounter question formats you haven't seen before. The HESI's question phrasing can be tricky: questions sometimes include a correct-sounding distractor that fails for a specific detail in the scenario. Learning to spot those patterns through varied practice reduces surprise on exam day.
Sleep and scheduling matter more than most candidates expect. Testing six sections back-to-back requires sustained focus. Fatigue-driven careless errors in the Reading and Grammar sections are common in the second half of a long exam session. Some testing centers let you take a break between sections — use it. Eating a real meal before the exam and avoiding heavy meals that cause an energy crash mid-exam are small logistics that actually affect performance.
The HESI A2 scores each section as a percentage from 0 to 100. There's no single passing score — schools set their own minimums, and those minimums vary considerably. Many programs require a minimum of 75% on each required section. Competitive programs at large university systems often require 80% or higher, and some use cumulative composite scores rather than section-by-section minimums. Your specific school's admissions page is the authoritative source for what they require — general guidance can be misleading if it doesn't match your program's policy.
The composite score (sometimes called the cumulative score) is a weighted average across all sections your school required. A strong performance in multiple sections can sometimes offset a weaker section when programs use composites rather than individual section cutoffs. But many programs have non-negotiable minimums for specific sections — failing to meet the minimum on any required section means the composite doesn't matter. Know your program's policy before test day.
Retake policies vary by school and testing center. Many programs allow one to three attempts at the HESI A2, with a mandatory waiting period between attempts — often 60 days. If you don't meet the minimum on your first attempt, use the score report to identify exactly which sections fell short and focus your additional preparation there. Don't retake the entire exam as if nothing went wrong — targeted preparation between attempts is significantly more effective than repeating the same general study approach. Review the hesi exam registration resources and your score breakdown before planning a retake study schedule.
Some schools calculate scores differently for repeated attempts — using only the most recent scores, the best scores across attempts, or an average. Know your school's policy before you retake. If they use your most recent scores, that changes the pressure dynamic: a poor retake can actually lower your application standing compared to leaving a borderline first score in place.
The HESI A2 and the ATI TEAS (Test of Essential Academic Skills) are the two dominant nursing school entrance exams in the US. They test similar content — math, reading, science, and English — but they're made by different companies, have different formats, and aren't interchangeable. Some schools accept either; most require specifically one or the other. If you're applying to multiple programs, check each program's requirement separately — preparing for the wrong exam because you assumed both programs used the same test is a costly mistake.
The ATI TEAS has 170 questions across four sections (Reading, Math, Science, English and Language Usage) with a total time of 209 minutes. The HESI A2 is longer when all sections are required but covers more content areas. Both are scored on section percentages, and both have school-specific minimums.
From a preparation standpoint, TEAS and HESI study materials don't fully overlap — some content overlaps, but the question formats and emphasis are different enough that preparation materials should match the exam you're actually taking. If you're taking the HESI, focus on hesi a2 examination practice specifically rather than general nursing entrance prep.
Some candidates who don't achieve their target score on the first attempt switch to schools that use the other exam and start fresh. This is a legitimate strategy but adds significant time — preparation for a different exam is not zero-effort. A better approach, if your score falls short, is to analyze your score report carefully, prepare specifically for the weak sections, and retake the same exam at the next available opportunity. Targeted preparation typically produces better results than switching exams midstream.
If you're genuinely unsure which exam to prepare for because you're applying to both HESI-required and TEAS-required schools, prioritize HESI preparation — the math, vocabulary, and science content overlaps enough that HESI prep builds transferable skills for the TEAS science and math sections. But don't try to fully prepare for both simultaneously from the start; pick a primary exam, reach your target score, then address the secondary exam with a focused supplemental prep period.
You'll receive your HESI A2 scores immediately after completing the exam in most testing formats. The score report shows your percentage score for each section along with a composite score. Some programs request that you self-report your scores during the application process; others have Elsevier send scores directly to the school. Know which process your school uses so scores reach admissions in the right format and on the right timeline.
If your scores meet your program's minimums, the HESI is typically just one component of the application — alongside GPA, recommendation letters, personal statements, and sometimes interviews. A strong HESI score won't overcome a weak GPA, and a perfect GPA doesn't always offset a marginal HESI score. Know how your program weights each component so you understand how competitive your full application is.
If your scores fall short on any required section, don't panic — check the retake timeline and make a study plan immediately. Most programs want to see improvement between attempts, not just a slightly-better-than-threshold score. Significant improvement — five points or more above the minimum on a weak section — demonstrates genuine preparation. Starting your retake preparation with hesi examination resources and a focused study schedule gives you the best chance of the outcome you need.
Nursing school admissions are competitive at many institutions, and HESI scores are a meaningful component of that competition. The students who get admitted aren't necessarily the smartest — they're the ones who prepared specifically, practiced consistently, and went into exam day knowing exactly what to expect. That's a repeatable process, not a matter of natural aptitude.
Request feedback if your scores fall significantly below target. Elsevier provides a score breakdown by content domain, not just by section — so you can see, within Mathematics, whether you're struggling with fractions, ratios, or dosage calculations specifically. That level of detail makes retake preparation much more precise than the section-level score alone. Use that breakdown. It's the most actionable output the exam produces.
Nursing school is demanding — the HESI A2 is designed to predict whether you'll succeed in that environment. Students who approach it seriously, prepare strategically, and hit strong scores are also signaling something to themselves: that they can handle structured, high-stakes learning. That mindset carries forward into the program.