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Khan Academy has great content — and it's free. The difference is what happens AFTER you answer. Khan shows the right answer. We diagnose WHY you picked the wrong one, warn you about patterns you've repeated, and adjust the next question to your exact level. The longer you use it, the better it gets at predicting where you'll struggle. Free tools can't do that because they don't remember anything about you.
Every SAT question ever written is available for $0. Yet the average score is still 1050. Content isn't the bottleneck — knowing what to practice is. Most students waste half their study time on stuff they already know. We target the exact gaps holding your score back, tell you WHY you get things wrong, and get smarter every session. That's what you're paying for.
Every wrong answer is automatically diagnosed to find the root cause — not just that you got it wrong, but WHY. Over time, this builds a profile of your mistake patterns. We use this to target practice at the root cause and warn you when you're about to repeat a pattern.
The Digital SAT is adaptive — your performance on Module 1 determines whether you get the harder or easier Module 2, which sets your score ceiling. Hard Module 2 → up to 800. Easy Module 2 → capped around 650. We're the only platform that trains specifically for this routing decision.
Your data stays here and keeps working for you. Come back anytime and pick up exactly where you left off — your mistake patterns, progress, and study history are all saved.
After every session, we show you the receipts: how many questions targeted your weak spots, what mistake patterns were caught, and how much more efficient the session was vs random practice. Most students study 2-3x more efficiently than with random practice.
You start with a diagnostic assessment that maps your skills across all exam domains. Based on your results, target score, and test date, we create a personalized study plan. Each day you get practice sessions with questions selected specifically for your level and needs.
The full diagnostic takes about 30 minutes. It uses targeted testing to efficiently assess your skills across Reading, Writing, and Math with fewer questions than a traditional test.
No, Mastery OS is entirely web-based. You can access it from any device with a modern browser—computer, tablet, or phone.
Yes, the platform is fully responsive. However, for the best experience during practice sessions (especially Math), we recommend using a computer or tablet.
We have over 10,000 practice questions covering every SAT topic across Reading, Writing, and Math. Questions range from easy to hard and are tagged with detailed skill information.
Yes, our questions are designed to match the format, difficulty, and style of the Digital SAT. We continuously update our content based on the latest test specifications.
We offer 9 session modes: BUILD (learning with hints), PROVE (test simulation), SPEED (pacing drills), STAMINA (endurance training), STRESS (high-pressure practice), DIAGNOSTIC (skill assessment), FULL TEST (complete SAT simulation), BOOST (targeted weakness practice), and MIXED (varied practice). Each serves a different phase of preparation.
Proof Cards are shareable badges you earn when you demonstrate mastery of a specific skill in PROVE mode. You can share them on social media or include them in college applications.
Battle Mode lets you compete head-to-head against friends. You both answer the same questions and see scores update in real-time. It's available on the Premium plan.
An AI tutor that remembers your entire learning history. It knows your mistake patterns, how fast you're improving, and what works best for you — and uses all of that to give you smarter advice every session.
Trap Reports identify the exact error patterns costing you SAT points. Each trap shows severity, how many times you've been caught, point impact, and a remediation plan with targeted practice questions.
Expert Mode serves only 99th percentile difficulty questions. It's for advanced students scoring 1450+ who need to master the hardest content. Available on Premium and Elite plans.
Yes. Click "Different Question" to swap any question for a different one at the same skill and difficulty level. No penalty, no disruption to your session flow.
Mastery OS has a free forever tier — no credit card, no trial expiration. You get the diagnostic, basic practice, and limited AI coaching. Upgrade anytime for unlimited access.
Yes, you can cancel your subscription at any time from your account settings. You'll continue to have access until the end of your billing period.
Pro includes unlimited practice, 4 full-length tests per month, weekly plans, and detailed analytics. Premium adds unlimited tests, Battle Mode, Group Study rooms, and Proof Cards.
We offer a full refund within the first 14 days of a paid subscription if you're not satisfied. After that, you can cancel anytime but refunds are not available.
We offer need-based discounts for students who qualify. Contact us through our contact form with your situation and we'll work with you.
Our predictions are calibrated to be within 30 points of actual scores for students who have completed at least 2 weeks of practice. Accuracy improves as you use the system more.
Results vary based on starting level, consistency, and study time. Our personalized system is designed to maximize improvement by focusing on your highest-impact skill gaps. The more consistently you practice, the more the AI can optimize your learning path.
Yes, Pro and Premium plans include parent reports. Parents can see practice time, skill progress, and predicted scores—but not individual question responses.
Yes, your skill model and all progress data is saved indefinitely. If you take a break, the system will account for potential forgetting and adjust recommendations.
We support the latest versions of Chrome, Firefox, Safari, and Edge. For the best experience, we recommend Chrome.
Yes, we use industry-standard encryption for all data in transit and at rest. We never share your personal information with third parties. See our Privacy Policy for details.
Yes, Mastery OS is available as a Progressive Web App (PWA). You can install it on your device and practice offline. Your progress syncs automatically when you reconnect.
We're here to help. Reach out and we'll get back to you within 24 hours.
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