Official ACT tests are the most accurate for predicting your score and matching real difficulty, but high-quality third-party tests are valuable for extra practice, especially for drilling specific skills. Use both, but trust official material most when you want a realistic score estimate.
Why official tests are the gold standard
Official ACT questions reflect the exact style, difficulty, and scoring of the real exam. Your scores on them are the most reliable predictor of test-day performance, so save some for late in your prep.
Where third-party tests help
There are only so many official tests, so good third-party material adds volume for drilling and skill-building. Quality varies, though; some sources are too easy, too hard, or test things the ACT never would.
How to judge quality
Good practice mirrors official question style and includes clear explanations. Platforms like thirty-six focus on ACT-style questions with explanations so your practice builds the right habits; see where to find free ACT practice tests.
Use each for its strength
Use third-party quizzes for frequent, targeted drilling between full tests, and official full-length tests for realistic timing and score prediction. Decide your mix with how many ACT practice tests to take.
Don't over-weight one bad score
A low score on an unusually hard or poorly made third-party test isn't cause for panic. Anchor your expectations to official material.
Review is what matters
Official or not, a test only helps if you analyze it. Follow how to review ACT practice tests to turn every test into points.
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.