HESI A2 guide · updated 2026-09-29
How long should you study for the HESI A2?
Plan on 3 to 6 weeks at about an hour a day. The Core Four alone can be ready in about 3 weeks; add a week or two for each science section your program requires, especially Chemistry or Anatomy and Physiology if you have not taken the course recently.
Start with a diagnostic
Take one timed set of each section you must sit. Your weakest section decides the length of your plan. Math usually improves fastest, reading and vocabulary slowest.
A four-week plan (Core Four + Anatomy and Physiology)
| Week | Focus | Daily practice |
|---|---|---|
| 1 | Math fundamentals: fractions, decimals, percentages, conversions, military time, Roman numerals | 20 math questions + 15 vocabulary words |
| 2 | Grammar rules and reading strategies; algebra word problems | 15 grammar + 1 reading set + 10 math |
| 3 | Anatomy and Physiology by system; keep vocabulary going | 20 A&P + 15 vocabulary |
| 4 | Timed full-section practice and review of weak topics | One full section a day, rotating |
Section by section tips
- Math: memorize the common conversions (1 oz = 30 mL, 1 kg = 2.2 lb, 1 in = 2.54 cm) and practice converting 12-hour to 24-hour time until it is automatic.
- Reading: read the question first, then the passage. Eliminate answers that are true in general but not supported by the passage.
- Vocabulary: learn words in context. Medical prefixes and suffixes help you guess unfamiliar words.
- Grammar: most errors fall into a small set, so review a list of rules and test yourself on each.
- Anatomy and Physiology: learn structure and function together, system by system.
When to book the exam
Book once you score at least 5 points above your program's minimum in every required section on timed practice. Remember some schools make you wait 30 to 60 days between attempts, so a rushed first attempt can cost an application cycle.
Adding science sections
Each science section is shorter than a Core Four section, but it depends on content you either remember or do not. If your program requires Biology or Chemistry and you last took the course more than a year ago, add a week for each. Biology overlaps with Anatomy and Physiology on cells and genetics, so studying them together saves time. Chemistry needs practice with balancing equations and mole calculations, not only reading.
Signs you are ready
- Two timed practice sets in a row at or above your target in every required section.
- You finish each section within the recommended time with a few minutes left to review.
- Your wrong answers are scattered rather than concentrated in one topic.
- You can do all the common conversions and military time without writing out a table.
- Vocabulary misses are words you have seen before but confused, not words you have never met.
Frequently asked questions
Can I study for the HESI A2 in 2 weeks?
Possible for the Core Four if your math and reading are already strong. With sciences, allow more time.
Which section is hardest?
It varies. Many applicants find Anatomy and Physiology and Chemistry hardest because they need content recall, not just skill.
Try the free HESI A2 practice test
Questions tagged to the official outline, with an explanation for every answer. 15 free a day, no sign-up.
Start freeSources: Tarrant County College: HESI A2 Exam Information · Gateway Technical College Testing Services: HESI A2 · Elsevier: Admission Assessment Exam Review (HESI), 6th edition. Independent study material. Not affiliated with or endorsed by Elsevier.