Desmos trick2:45
Desmos: solve any system in 10 seconds
desmos · graphing
Every wrong answer points to what to learn next.
DecodedSAT diagnoses your mistake and sends the exact video that fixes it - no random practice sets
More practice isn’t the answer.
Endless drilling just repeats the same mistake faster. One-size-fits-all explanations tell you the right steps, but never the one you personally got wrong. So you grind through hundreds of questions and the same gap follows you into the next practice test — because nothing ever named it.
How DecodedSAT works
Three steps. Every wrong answer turns into the exact thing you need to watch next.
1You get one wrong
A question trips you up
You answer a real SAT-style math question and miss it. Instead of just flashing a red X, DecodedSAT holds onto your answer.
If 3(x−2) = 12, then x =
642
2We diagnose it
The real mistake gets named
DecodedSAT looks at the wrong answer you chose and identifies the specific misconception behind it — not just that you’re wrong, but where the thinking broke.
Diagnosis
You divided before distributing the 3. This is a distribution order error.
3The fix
One explainer video, aimed at that gap
You get a 2–4 minute explainer video built for that exact mistake. Watch it, understand the topic, learn some tricks and the misconception is gone — for good, not just for this question.
Tips and tricks for Distrubiton Order mistakes.
3:10 · targeted explainer
The video library
Short, specific explainers — Desmos shortcuts and mistake-type breakdowns you can search or get served automatically.
Mistake type3:20
Sign errors when you factor quadratics
algebra · factoring
Mistake type3:10
Distributing before you divide
algebra · linear eq.
Desmos trick4:05
Desmos: reading a table as a regression
desmos · data
Our mission
I built DecodedSAT as a student, for students. I’ve actually sat the SAT, and I know what it’s like to keep missing the same type of question over and over without ever understanding why. Every “study tool” I tried just threw more questions at me and told me to grind harder.
So I made the thing I wish I’d had: something that tells you exactly what went wrong and visually shows and explains the specific error + the topic. That’s it. You don’t waste any time getting more questions wrong, you watch the video and understand it all.
DecodedSAT is completely free right now.
The goal is to actually help people raise their scores — not to monetize before it’s earned. If it’s genuinely useful to you, that’s the whole point.