Not an LLM guessing. A deterministic engine that tracks every concept you’ve mastered, predicts your score trajectory, and points you to the single highest-impact thing to study next.
Free forever: practice, real-time mistake intelligence, post-test reports.
The model
What happened, and what is. Real-time mistake intelligence as you practice, post-test coach reports, honest concept mastery, and adaptive question selection. All of it free, forever.
What to do next, by how much, against what goal. The plan reverse-solved from your target score, the single concept that lifts your composite most, and the mastered material that's quietly slipping.
What you get
Every number below is the kind a real session produces, traced to mastery, IRT, the prerequisite DAG, or the expected-Δ optimizer. Never a placeholder.
An optimized plan, not a list of weak concepts.
Your next 38 minutes
English · Grammar Rules
18 min · +0.4 composite
Comma-splice mastery is your highest-leverage gap. The prereqs are clear, and four dependents unlock once you clear it.
Suppressions
Counterfactuals with a real composite Δ.
If you master Algebra
composite rises by
+1.2
A calibrated projection, not a guess.
29
by test day
Projected at exam
29 / 36+2.1
2 concepts are at risk of decay. Review them before they leak.
The forgetting curve, ranked by due-ness.
Trigonometry
Reading Inference
Reverse-solved from your target composite.
Reach 32 by week 6 at this pace
Starting from 27, the engine projects 32.0 on test day.
52
Q
95
min
6
wks
Answer a few questions and the engine starts learning immediately. No credit card, no LLM, no placeholders.
ACT study tips
A few evidence-backed habits, and how ThirtyPlus turns each one into a personalized daily plan.
Tip 1
Practice in short, spaced sessions. 20 minutes of focused drills beat a four-hour marathon because spaced repetition moves concepts into long-term memory.
Tip 2
Review every miss, not just the ones you're unsure about. A careless slip and a true knowledge gap need different fixes, and the engine tells you which.
Tip 3
Track mastery by concept, not by question count. Learning is about the ideas behind the questions, and the engine organizes your review around those ideas.
Tip 4
Always time practice like the real exam. Pacing is a scored skill on the ACT, and untimed practice won't improve it.
Tip 5
Set a target date and work backward. The engine projects your score trajectory and flags when you're ahead or behind plan.
How ThirtyPlus helps
Every question you answer updates a real mastery model. The engine then turns the tips above into one concrete next step per session. “Study more” becomes “review comma splices for 12 minutes.”
Yes. The full ACT question bank, adaptive missions, timed exams, real-time mastery tracking, AI tutor hints, and post-test reports are free forever. No credit card required to start.
Instead of rattling through random questions, a deterministic intelligence engine tracks real mastery of every concept from your answers and picks the single highest-impact thing to study next. No LLM makes a decision. Algorithms do.
All four: English, Math, Reading, and Science. You get practice questions by concept and difficulty, full-length timed simulations, and a 30-question diagnostic that seeds your baseline.
Yes. Beyond one-time advice, the engine surfaces tips tailored to your own pattern of mistakes: where you lose time, which concepts keep recurring, and what to review first. Every missed question includes a full explanation.
Track composite and section scores against your target test date. The engine projects your trajectory over time and adjusts recommendations so you always have a clear, highest-impact next step.
Yes. A free account lets the engine keep your mastery profile so recommendations stay personalized. There's no credit card and nothing is gated behind a trial.
ThirtyPlus is an ACT prep tool built around one idea: you learn concepts, not questions. The free question bank, timed exams, and mastery tracking are free for everyone. The paid ThirtySix tier surfaces the why behind every recommendation if you want it.
