ACT · Free Skills Diagnostic
Find out exactly which skills are costing you ACT points — in 20 minutes, free.
Most students grind practice tests without knowing what’s actually wrong. Take the free Skills Diagnostic and get a projected ACT score plus a letter grade on every skill on the test.
No credit card. Just your email — the diagnostic and study guides are free.
A higher ACT score → better schools → more scholarship dollars.
Every point moves the needle on admissions and aid. Your test date isn’t getting further away — start where it counts.
Stuck and guessing
You’ve taken practice tests, but you still don’t know why you’re stuck. Studying feels like a shot in the dark.
A number and a plan
A projected score and a grade on every skill — so you know exactly which handful of things to fix to move up.
Diagnose → drill → verify
Diagnose your weak skills, drill only those with targeted practice, then verify with full-length tests. No wasted reps.
Everything in your ACT course
Start free, then climb only as far as you need.
- Skills Diagnostic — projected score + a grade on every skill, in ~20 minutes
- Study Guides — clear lessons + answer keys you can print or save as PDF
- Progress that follows you across devices
- Full Practice Tests — real, timed, full-length, auto-graded
- Targeted Practice — adaptive drills tuned to your weakest skills
- The Playbook — the strategies and secrets for each section
Why it works
Every question is difficulty-rated on real student responses.
As students answer, Rubicon Prep learns how hard each question truly is — so your practice is calibrated to your level, not a guess. The more you practice, the sharper it gets.
“I've never felt better about an academic accomplishment.”
“I hated the SAT before working with Classic Test Prep. Now it makes so much more sense, and I was confident taking the test.”
“Learning the strategies was super helpful but also easy to understand. You really learn how to think about the questions the right way.”
Start free. Upgrade only if it’s working.
Full access. Cancel anytime.
A private tutor runs $60–100 an hour. Full access to Rubicon Prep — every practice test, the targeted drills, and the Playbook — is $39/month, less than a single tutoring session, and built on the same diagnosis-first method a great tutor uses.
Put in the work and raise your score — or your money back. Proof required: submit it with the Help button for a full refund.
Questions, answered
Is it really free?
Yes. The Skills Diagnostic and the study guides are free with just an email — no credit card. You only pay if you upgrade for full practice tests, targeted practice, and the Playbook.
Is this only for the ACT?
This page is the ACT course. We also cover the ACT, SAT, and CLT — switch tests any time from the menu on the left.
Does this replace a private tutor?
It does the part a great tutor does first: find your specific weak skills and drill them. For a fraction of one tutoring hour you get the diagnosis and the targeted practice — self-paced, on your schedule.
How fast will I improve?
That depends on the work you put in, but the diagnostic gives you a focused plan on day one, so none of your study time is wasted on skills you’ve mastered.