Master your mistakes
Free AP Physics 1, AP Physics C: Mechanics, and AP Chemistry practice, with no account required. Wrong answers aren't random: every diagnostic, drill, and interactive simulation here ties each one to a specific misconception, so you can see which mistakes keep coming back and clear them for good.
Drill in the Blaster
The same misconception-coded questions, played as an arcade shooter. Each unit ships its own creature set, and wrong shots still map to named misconceptions, so it counts toward clearing them.
Open the arcadeRun it with a class
Set up a class with coded rosters (no student names) and watch which misconceptions are clearing on the dashboard. Students rejoin with their code and PIN, so their work reaches your dashboard from any device.
Teacher guide
How it works
Misconception-coded distractors
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Misconception-coded distractors
Every wrong answer choice on this site maps to one named, research-anchored misconception. When you miss a question, you don't just see the right answer. You get adaptive remediation that drills the underlying confusion until you've cleared it.
Mastery rule
Two in a row clears it
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Two in a row clears it
Each misconception stays in your active queue until you answer two of its items correctly back to back. Practicing on your own needs no sign-up; your progress saves in this browser. In a class, your roster code and PIN report your results to your teacher's dashboard from any device you practice on.
Your dashboard
Every misconception, in one place
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Every misconception, in one place
The dashboard gathers every misconception you have run into and shows which ones you have cleared and which are still queued, across all units and both courses. It is the running map of what is left to fix.