Best ACT Practice Tests for High School Students The single best free ACT practice tests are the official full-length tests on ACT.org . They use retired, real ACT questions, come as downloadable timed PDFs and browser-based tests, and include scoring keys so you can convert your raw score to a scaled score the same way the real test does. Two strong secondary options are the free full-length tests from major prep publishers like Kaplan and The Princeton Review, which offer automatic scoring and section breakdowns. Start here: download one official PDF right now, block off a single uninterrupted timed window matching the full test duration, and run it under timed conditions. That one session will tell you more about your skill gaps than a week of passive studying. If you find yourself stuck after reviewing your results, Wonprep’s ACT tutoring programs can convert that diagnostic data into a targeted weekly plan. Best overall: ACT.org official full-length practice tests (retired real questions, free PDF and browser versions) Best for automatic scoring: Major prep publisher full-lengths (Kaplan, The Princeton Review) with built-in score breakdowns Best for quick section practice: Rep