Privacy
Last updated 13 September 2026.
Your study progress
Bookmarks and practice history are saved in your browser's local storage. There is no account or automatic cross-device sync. Clear this site's browser data to remove them. If storage is unavailable, the library still works, but progress lasts only for the current visit.
Back up or move your progress
Download a backup on the browser and website address where you studied, then import it on the new one. The file is processed on your device and is not uploaded.
Moving from our earlier address? Download from the old website, then import on the AppCradle address.
Import keeps existing bookmarks. For a question saved in both places, it keeps the history with more attempts, or the latest history if the totals match. Importing the same file again does not add attempts.
Enable JavaScript to back up or import progress.
Usage analytics
We use Microsoft Clarity to understand how people use the library through usage metrics, heatmaps and session recordings. Clarity may collect interaction, device and page information and use cookies. We retain its default masking and consent handling. We do not send custom user identities, backup contents or search text as analytics events.
We measure actions such as opening an exam, revealing an answer, starting and completing practice, and sharing a link. Campaign tags help us understand which organic channels bring visitors. Local development and preview visits are excluded.
Read the Microsoft Privacy Statement and Clarity's data collection documentation for details. Browser privacy tools can block third-party analytics without affecting question browsing.
Hosting and external links
Cloudflare hosts this site and processes requests to deliver its pages and files. Source papers open on external websites, which have their own privacy practices. Learn more in Cloudflare's privacy policy.