The latest articles on DEV Community by Examova Platform (@examova). https://dev.to/examova https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4056735%2F7dfb6c4e-d24f-49e7-b777-47bea264bf65.jpg https://dev.to/examova en Examova Platform Sun, 02 Aug 2026 17:44:07 +0000 https://dev.to/examova/the-math-behind-wrong-answers-should-come-back-bck https://dev.to/examova/the-math-behind-wrong-answers-should-come-back-bck <p>Most exam-prep apps let you mark a flashcard wrong, then do nothing with that. The card goes back in the same pile as everything else. We fixed this in Examova this year, and it's basically one idea: a missed question needs a different review schedule than one you already know.</p> <p>We run SM-2 spaced repetition across 1,746 flashcards (PMP, CIPS Level 4, Business English). A correct answer extends the interval. A missed one collapses it and brings the card back soon. Do that consistently and your review queue fills with your actual weak spots, not cards you've already mastered.</p> <p>The harder part was grading, not the interval math. It runs server-side, not in the browser. That stops anyone reading the answer key from client-side code, and keeps the interval calculation tied to a source that can't drift out of sync with what you actually got right.</p> <p>None of this is new — practice testing and spaced review are well-tested learning techniques. The real work is making the review queue the default path, not a setting people have to find.</p> <p>Full disclosure: I'm the founder of Examova (examova.com), where this runs live. Curious how others building quiz or study tools handled "what counts as mastered" — SM-2, a custom curve, or something else?</p> learning productivity webdev