The best ACT prep books combine official-style practice, clear explanations, and content updated for the enhanced ACT—not outdated 75-question English or 60-question Math sections. Books supplement practice tests and review; they do not replace timed full-lengths.
What to look for
- Official ACT material first: real retired questions and accurate scales—see free ACT practice tests.
- Section-specific drill books: useful when one section lags (English grammar, Math topics).
- Full-length tests in the back: only if answer keys include conversion tables for that form.
What to skip or use carefully
- Books with only third-party tests and no official tie-in
- Editions that predate the enhanced ACT without updates
- “Trick-only” books with no content review or error analysis
Compare quality in official vs third-party ACT tests. When official tests run out, see alternatives after official practice tests.
Books vs online prep
Books excel at paper practice and marking up passages. Online tools excel at instant scoring, filtering by topic, and adaptive drills. Most students mix both. Your study loop is in how to study for the ACT.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.