Best Test Prep Courses Online in 2026: SAT, ACT, MCAT & More
QUICK VERDICT
Bottom line: The best test prep course depends on which exam you're taking and how you study. For the SAT or ACT with a written score guarantee, Prep Expert is the standout; for a comprehensive, widely-trusted program — and the strongest MCAT option — go with Kaplan; for affordable, self-paced SAT prep, Magoosh.
- Best score guarantee (SAT/ACT): Prep Expert
- Best all-rounder + best for MCAT: Kaplan
- Best budget self-study: Magoosh
- Try first: the free official practice (College Board, ACADEMY, AAMC) — if you're close already, you may not need a paid course
Last updated: June 2026. Written by Josh Hutcheson, editor of OnlineCourseing. See our review methodology.
Good test prep courses earn their cost when they raise your score enough to change which schools or scholarships are within reach — but the right pick is exam-specific. Below we point you to the option that fits each test and study style, and link our in-depth guides for the exams readers ask about most.
SAT & ACT prep
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For the SAT and ACT, the biggest decision is structure: a guaranteed-score program, a comprehensive course, or self-paced practice. Prep Expert is built around a score-improvement guarantee and is worth it if you respond to a structured, accountable program. Kaplan offers the broadest range of formats (live, on-demand, tutoring). Magoosh is the value pick for disciplined self-studiers. Start with our guides to studying for the SAT, SAT vs ACT, what counts as a good SAT score, a good ACT score, and ACT tips and tricks.
See Prep Expert SAT & ACT prep →
MCAT prep
The MCAT is a different animal — longer, broader, and far more expensive to get wrong. Kaplan is our top pick for most students thanks to its content depth, full-length practice, and range of formats, though it isn't the cheapest. We compare it head-to-head in Kaplan vs Princeton Review for the MCAT, and round up every option in our best MCAT prep course guide and best MCAT resources. New to it? Read how hard the MCAT is and when to start studying first.
GRE, GMAT & LSAT
For graduate and law admissions tests, the same logic applies: pick a guaranteed-score program if you need accountability, or self-paced prep if you're disciplined. Prep Expert runs structured courses across the GRE, GMAT and LSAT with the same score-guarantee model as its SAT/ACT prep.
Test prep providers compared
| Provider | Exams | Best for | Our take |
|---|---|---|---|
| Prep Expert | SAT, ACT, GRE, GMAT, LSAT | Score-guarantee seekers | Structured + accountable; the guarantee is the draw |
| Kaplan | SAT, ACT, MCAT, GRE, GMAT, LSAT | Comprehensive prep + MCAT | Deep content + most formats; premium price |
| Magoosh | SAT, GRE, GMAT | Budget self-study | Great value; less hand-holding |
Frequently asked questions
Are paid test prep courses worth it?
If a higher score changes your admissions or scholarship outcomes, yes — the cost is small next to tuition. Take a free official practice test first; if you're already near your target, structured self-study may be enough. If you need a bigger jump or accountability, a guaranteed-score program pays for itself.
Which is the best MCAT prep course?
For most students, Kaplan — for its content depth, full-length practice, and format choice. Princeton Review is the main alternative; we compare them directly in our Kaplan vs Princeton Review MCAT guide.
How early should I start studying?
It varies by exam, but earlier is almost always better — it lets you spread study, take more full-length practice, and re-test if needed. See our exam-specific guides above for timelines.
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