Flashcard Drill
All 71 questions as recall cards. Say the answer out loud before flipping - retrieval practice is what turns reading into recall you can use under pressure.
Keyboard: Space flip · ← → navigate · 1 review again · 2 got it
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How to use these properly
- Speak, do not think. An answer you can think is not an answer you can say. The gap between the two is exactly what fails candidates.
- Fifteen minutes daily beats two hours on Sunday. Spaced retrieval is the whole mechanism.
- Be harsh when grading. If you missed a key point, mark it “review again”. Optimistic self-grading is the most common way this practice fails.
- Open the full lesson for anything you flag twice - the short answer is a summary, not the understanding.
Curriculum
- Design a URL Shortener (TinyURL / bit.ly)2 Q · 16 min
- Design a News Feed (Twitter / Facebook Timeline)2 Q · 18 min
- Design a Chat System (WhatsApp / Slack)2 Q · 17 min
- Design a Notification System2 Q · 15 min
- Design a Video Streaming Platform (YouTube / Netflix)2 Q · 17 min
- Design a Ride-Hailing System (Uber / Lyft)2 Q · 16 min
- Design a Web Crawler and Search Index2 Q · 17 min