Best ACT Prep Books for 2026–27

• Best overall: The Official ACT Prep Guide 2026–2027. Four full-length official tests with explanations.
• Best for one weak section: the matching Official ACT subject guide (English, Math, Reading, or Science), each with online practice questions.
• Best if you want everything: The Official ACT Prep and Subject Guides 2026–2027 Complete Set.
• Best free option: ACT's free official practice tests, plus our two free full-length ACT practice tests.

Picks are based on publisher-listed contents, alignment with the current official ACT format (the enhanced ACT used for all national testing since September 2025), and edition currency. This isn't based on testing every book. We list only titles whose current edition and contents we could confirm from the publisher. For now, that means ACT's own books. We don't show star ratings or prices, and no publisher paid for placement.

The ACT changed a lot in 2025, and older editions are still everywhere, especially used copies. Before you buy (or open) any ACT book, flip to a practice test and check:

If a book fails the check, it can still teach you grammar rules and algebra. But its timed practice will train the wrong pace, and its score conversions won't match today's test.

About the official guide: the 2026–2027 edition is ACT's current guide. ACT's product description lists four full-length tests, each with the optional writing test, but it doesn't spell out section lengths. When you open it, run the check above on the first practice test before timing yourself.

Big test-prep publishers often put out new ACT editions, and some are good for extra strategy and drills. We haven't listed specific third-party titles because we couldn't confirm their current editions and contents from the publishers. If you buy one:

• Buy the newest edition year and run the 60-second check above.
• Treat third-party practice tests as drills, not score predictors. Only official ACT tests use real ACT questions and scoring.
• Don't buy more than one comprehensive book. One guide plus official practice tests is plenty for most students.

A simple 8-week plan with the official guide

1. Week 1: Take practice test 1 under enhanced timing. Log every miss by category.
2. Weeks 2–4: Study the chapters for your two weakest areas. Do untimed practice sets, then timed single sections.
3. Week 5: Take practice test 2. Compare category by category with test 1.
4. Weeks 6–7: Re-drill whatever didn't improve. Add a subject guide here only if one section is stuck.
5. Week 8: Take practice tests 3 and 4, a few days apart, in full test-day conditions.

1. Don't read it cover to cover. Take one practice test first, then read only the chapters for your weakest categories.
2. Save two full tests for the last three weeks so you have fresh, official material for timed final checks.
3. Time everything at enhanced-ACT pace: 35 minutes for English, 50 for math, 40 for reading, 40 for science if you're taking it.
4. Time your online access. ACT lists one year of online question-bank access for each subject guide, so don't activate a code months before you'll study.
5. Keep an error log (question, why you missed it, the fix). It's worth more than a second book.

ACT offers free full-length practice tests (including science and writing) and a free 2025|2026 practice test booklet. Take one, look at where you lost points, and buy only what fixes that. For the full test overview, see our ACT guide, and for dates, our 2026–27 ACT test dates.