About Kovrio
Kovrio is a free site of practice questions for AP® classes. It was built by a high schooler who got tired of photographing textbook pages, uploading them to ChatGPT, and asking it to make a quiz -- over and over, every unit. This is that, without the re-uploading.
The idea behind it is retrieval practice: pulling information out of your head is harder -- and sticks better -- than reading it again. Every question here is one more rep of that.
What's covered
Kovrio covers nine AP® subjects, all of them complete — 6,770 questions across 70 units and 677 topics. Every question is filed under the topic it belongs to, so you can drill one piece of the course at a time instead of wading through everything at once:
- AP® U.S. Government and Politics — 5 units, 60 topics, 600 questions
- AP® Biology — 8 units, 60 topics, 600 questions
- AP® U.S. History — 9 units, 105 topics, 1,050 questions
- AP® Psychology — 5 units, 35 topics, 350 questions
- AP® Chemistry — 9 units, 91 topics, 910 questions
- AP® World History — 9 units, 71 topics, 710 questions
- AP® European History — 9 units, 88 topics, 880 questions
- AP® Human Geography — 7 units, 68 topics, 680 questions
- AP® Environmental Science — 9 units, 99 topics, 990 questions
Every course follows the College Board's own unit and topic breakdown, so the list on a subject page should match your syllabus.
How it works
Pick a subject, then a unit. From there you can quiz a single topic (10 random questions) or take a whole-unit quiz that pools questions from every topic in the unit.
Each quiz shows one multiple-choice question at a time. Questions and answer choices are shuffled every time you load a quiz, so retaking one isn't just memorizing option positions. When you pick an answer, you'll immediately see whether it was correct along with a short explanation. At the end, you'll get your score and a list of exactly which questions you missed.
What makes it different
Mastery is tracked per topic and per unit, not as one overall score -- a 78% average hides the fact that you have Unit 3 cold and Unit 5 not at all, and Kovrio shows you that split. Questions you miss on a whole-unit quiz also get weighted back in next time instead of disappearing once you've seen them, so a wrong answer turns into another rep rather than a dead end.
Two pages read that history back to you. History lists your recent quizzes and scores, and Insights turns them into a study plan: your strongest topics, the ones that need another look, and what to redo first. Both are worked out in your browser from your own scores.
Kovrio uses a free account (Google or email) so your progress is saved to you, not just one browser: log in on any device and your scores, History and Insights are there.