CNA guide · updated 2026-09-29

How long should you study for the CNA written exam?

If you just finished a state-approved training program (federal minimum 75 hours), about 2 weeks of review at 45-60 minutes a day is enough for most people. Spend over half of it on Basic Nursing Skills and Activities of Daily Living, which make up 57% of the scored questions.

Start from what your training covered

Federal rules require a nurse aide training program of at least 75 clock hours, including at least 16 hours of supervised practical training. Your class already taught everything on the written exam. The job of review is to turn it into fast, confident multiple-choice answers.

If it has been months since training, or English is not your first language, plan 3 to 4 weeks instead of 2, or consider the oral exam option.

A 14-day plan

Days	Focus	Why
1	One 70-question timed diagnostic	Find your weak domain before you study
2-4	Infection control, safety, emergency response	Largest part of Basic Nursing Skills (35%)
5-6	Vital signs, measurements, intake and output, reporting	Technical procedures and data collection
7-8	Hygiene, nutrition, elimination, positioning, independence	Activities of Daily Living (22%) and Self Care (7%)
9-10	Client rights, communication, legal and ethical behavior, the care team	Role of the Nurse Aide (26%)
11	Dementia, anxiety, depression, grief, cultural needs	Psychosocial Care Skills (10%)
12	Full timed mock, review every wrong answer	Check pacing and weak areas
13	Weakest two areas only	Targeted repair
14	Light review of rules you missed, rest	Arrive fresh

Rules that answer many questions

Safety first, then the client's rights, then comfort.
When something changes or seems wrong, report it to the nurse. The aide observes and reports; the nurse assesses.
Knock, introduce yourself, explain the procedure and provide privacy before any care.
Let clients do as much as they can for themselves.
Clients may refuse care. Respect the refusal, do not force, and report it.
Restraints need an order and are a last resort; try alternatives first.
Wash hands before and after every client contact, and after removing gloves.

How to review a wrong answer

For each miss, write one line: what the question was really testing, and the rule that makes the correct answer right. After a week you will notice the same dozen rules keep coming back. That list is your final-day review sheet.

Pay attention to key words. "First" asks for priority, usually safety. "Best" asks for the most respectful, in-scope action. An option can be true and still not be the best answer.

Do not forget the skills test

The written exam is only half of certification. Practice the skills evaluation separately with a partner, because it is scored on critical steps that multiple-choice study will not build.

Where people lose points

Candidates who fail the written exam rarely fail on obscure facts. They lose points on scope and priority questions, where two options sound reasonable. The fix is to ask two questions about every option: is this something a nurse aide is allowed to do, and does it put safety and the client's rights first? The option that passes both is usually correct.

The second common loss is psychosocial questions about dementia and grief. The correct answers favor calm redirection, validation of feelings and a consistent routine, not arguing with a confused client or offering false reassurance such as "Everything will be fine."

Frequently asked questions

Can I pass the CNA written exam studying one week?

Many people do if training is recent. Use the first day for a diagnostic and put the week into your two weakest domains.

How many practice questions should I do?

Two or three full 70-question mocks plus a few hundred topic questions is plenty. Reviewing mistakes matters more than volume.

Try the free CNA practice test

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Sources: 42 CFR 483.152 - Requirements for approval of a nurse aide training and competency evaluation program · 2024 NNAAP Written (Oral) Examination Content Outline (NCSBN / Credentia). Independent study material. Not affiliated with or endorsed by NCSBN or Credentia.