The prep book — but adaptive, current, and free.
Prep books like PrepPros are good at one thing: teaching every topic, one at a time. But they're static — everyone grinds the same topics in the same order, even the ones they already know. PrepLion keeps the topic-by-topic mastery, then points you at exactly the topics you need.
Take the free diagnostic| Prep book (~$30) | PrepLion (free) | |
|---|---|---|
| Price | $30–40 per subject | Free |
| Which topics you study | All of them, in a fixed order | The ones YOUR diagnostic flags — skip what you know |
| Adapts as you improve | No — same book for everyone | Yes — targets your weak topics + your misses |
| Practice | Fixed problem sets | Unlimited; 'miss it → 5 more like it' |
| Updated for the enhanced 2025 ACT | Often written for the old test | Current — trig, graph/VIQ passages included |
| Projected score | No | Yes — see if you're on track for your target |
| Study plan for your test date | No | Yes — a day-by-day plan to your exam |
| Topic explanations + strategy | Yes — a real strength | Yes — free method cards + ranked-frequency guides |
Best of both: use the book's idea, free
A book's real value is ranked topic mastery and clear explanations. We give you that free — the most-tested topics ranked by frequency, each with a method — then the diagnostic tells you which ones to start with so you don't waste time on what you've already got.
ACT® and SAT® are registered trademarks of ACT, Inc. and the College Board, respectively, neither of which is affiliated with or endorses this product. PrepPros and other prep-book brands are trademarks of their respective owners and are referenced for comparison only.