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- 128 questions across 20 leakage topics.
- Code reviews, scenarios, true-or-false, and multiple-select tasks.
- Practice, exam, daily, weak-topic, and bookmarked modes.
- Hints, confidence ratings, bookmarks, timers, and keyboard controls.
- Secure server-side grading and detailed corrections.
- Plotly.js reports, local history, achievements, export, and printing.
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Question navigator
Keyboard: 1–4 select, ←/→ navigate, B bookmarks, H shows hint.