We have completely redesigned the mistake revision sheet to offer a more structured and educational experience, including real page previews, interactive diagrams, and 'Try it' practice questions. New functionality allows users to customize their sheets—choosing subjects, formats, and ink-saver modes—with full support for PDF exporting, PNG sharing, and mobile-friendly zooming. Backend support was also added for generating AI-driven content, cached via Redis, to provide targeted study materials and key facts for every fix session.