sanjogmahto/Preparation-Zone-MERN-STACK- ? reverse-engineered prompt

Build me a full stack mock test and practice app for students preparing for exams like placements, GATE, CAT, or GRE.

I want a clean website where a student can sign in, or just continue as a guest, choose a test, take a timed exam, and see the score right away with correct answers and explanations. The exam experience should feel real, with question navigation, review marking, automatic submission when time runs out, and scoring that includes negative marking.

Also make a dashboard that shows performance history, subject wise results, accuracy, time spent, and a leaderboard so students can compare progress. Include a profile page where they can upload a photo or use a simple avatar. Add dark mode and light mode too.

On the admin side, I need a simple area to manage tests, questions, answers, difficulty levels, and basic platform stats. If you need to look up current docs online while building, go for it.