Turn mistakes into
points.
335 original-book formula cards, 184 concept cards, and 345 real ETS practice questions. Adaptive sessions shaped by your diagnostic.
Topic readinessTap to view topic progress bars
Adaptive practice
Study cards
Tap Reveal, then mark how well you remembered it.
Browse library
Progress
Progress by topic
Light bar = reviewed once. Dark bar = mastered. The percentage below each topic is a priority-weighted readiness indicator, not a predicted exam score. Tap a topic to practice it.
Cloud sync across devices
Review history is always saved locally and works offline. To keep devices in sync, configure a private Cloudflare D1 database and a secret sync key (instructions in README). Use the same key on each device. Your cloud stores review events, allowing updates from different devices to merge.
Local-only mode.
Your data
Export a backup before changing hosts or clearing browser data. Imports merge records rather than replacing them. If Cloud sync is connected, deleting local storage does not erase cloud records.
How to install, host or delete
Open index.html locally, or serve the entire folder from any static HTTP host. For an installable offline app, host it under HTTPS or localhost, open in your browser and choose Add to Home Screen / Install app. Host all files together, including assets/, vendor/, and _worker.js. For cloud sync, configure D1 and your secret in Cloudflare Pages settings. The app operates without sync if those are unavailable.
To remove it: delete the hosted folder/site, remove the installed icon, and clear this site's storage or press “Clear local-only progress” first. Browser caches may need clearing separately. The source book itself is not included in this app.
Copyright: Exact formula images are extracted from your uploaded Cambridge University Press book. Keep the site private rather than publishing these copyrighted excerpts on a public repository or unrestricted website.