What each section tests, how to study it, and a plan that fits six weeks.
The HESI A2 rewards one kind of studying: answering questions and reading why each answer is right or wrong, at the exam's own pace. This guide covers the seven academic sections, what each one actually tests, and a simple six week plan. If you want to see where you stand first, take the free 25 question practice test, no signup, explanations included.
The HESI Admission Assessment (A2) is the entrance exam many nursing and allied health programs use to screen applicants. There are seven academic sections: Math, Reading, Vocabulary, Grammar, Anatomy and Physiology, Biology, and Chemistry. Your program chooses which sections you sit and sets its own passing targets, so the first step of any study plan is reading your program's admissions page. Most programs require the core four (math, reading, vocabulary, grammar) and many add anatomy and physiology; biology and chemistry are the least commonly required.
Section by section counts and timers are on the sections and timing page. What score you need, and how programs combine sections, is on the scores page.
Math is arithmetic before anything else: fractions, decimals, percents, ratios, unit conversions, and dosage style word problems. It is the most learnable section because every problem type repeats. Drill conversions until they are automatic. More on the math page.
Reading gives you health related passages and asks for main ideas, supporting details, and inferences. The skill is answering from the passage, not from what you already believe. Practice with a timer, because the reading section is where slow, careful readers run out of clock.
Vocabulary leans heavily on medical word parts. Learning prefixes, roots, and suffixes once lets you decode words you have never seen, which beats memorizing lists. The approach, with examples, is on the vocabulary page.
Grammar tests sentence boundaries, punctuation, agreement, and commonly confused words. Most points are lost to a small set of repeating patterns: run-ons, comma splices, its and it's, their and there. Learn the patterns, then drill them.
Anatomy and Physiology is the broadest section and the one students most often say felt different from their prep material. Study it systems first: what each organ system does, how the pieces connect, and the vocabulary of position and direction. More on the A&P page.
Biology covers cells, energy, DNA, and genetics basics. Chemistry covers atoms, bonding, reactions, moles, and pH. Only study these if your program requires them; check before you spend a week on chemistry your school never asks for.
Week 1: diagnose. Take a full diagnostic across your required sections and let the results pick your order. Study your weakest section first while there is the most time to fix it.
Weeks 2 to 4: one focus section per week. Learn the material, then drill practice questions and read every explanation, including for the questions you got right. Keep a short list of the facts that surprised you and reread it every few days.
Week 5: mixed practice. Alternate sections daily and start timing yourself at the real pace. Untimed accuracy that collapses under a timer is the most common unpleasant surprise on test day.
Week 6: full mocks and rest. Sit at least one full length, section timed mock. Review it, patch the last gaps, and stop cramming the day before. Six weeks is comfortable; four is workable with daily practice; two means prioritizing your two weakest required sections and drilling only those.
Studying sections your program does not require, rereading notes instead of answering questions, practicing untimed until the final week, and memorizing vocabulary lists instead of word parts. The other one is trusting prep material that never shows its sources: if a question's answer cannot be traced anywhere, you cannot tell whether you were wrong or it was.
This guide pairs with a free app diagnostic. The app has 1005 practice questions across all seven sections, every answer explained, timed mocks at the real section counts, and a one time $19.99 unlock, no subscription. The free part, a 25 question diagnostic, a mini mock, and full lessons and flashcards for several topics, is enough to know whether it helps you before paying anything.
How long should I study for the HESI A2?
Four to six weeks of steady daily practice is the common comfortable range. The honest answer depends on your diagnostic score: start with a practice test, and let the gap between your score and your program's target set the schedule.
Is the HESI A2 hard?
It is a wide exam rather than a deep one. Every topic is teachable, but seven sections cover a lot of ground, and the timers punish unpracticed pacing. Students who practice with explanations and a timer generally find it fair.
What is the best free way to start?
Take a free practice test with explanations, on this site or in the app's free diagnostic, and read why each answer is what it is. That one habit, questions plus explanations, is most of what paid prep does.
Do I need the official Elsevier review book?
Your program may recommend it, and it is the exam maker's own outline. Whatever you use, the study mechanics stay the same: practice questions, explanations, and real timing. Confirm your program's advice before buying anything, including our app.
HESI and HESI A2 are trademarks of Elsevier Inc. This app is an independent study aid and is not affiliated with, endorsed by, or sponsored by Elsevier, any nursing school, or any exam provider. Practice content is original and is grounded in openly licensed textbooks. Schools choose which sections they require and set their own passing targets, so always confirm the current requirements with your program.