I built my best friend a mistake engine for the NUST entry test

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This is a submission for the Hacktoberfest Weekend Challenge: Build for a Friend. My best friend SMS is studying for the NUST entry test — the exam that decides whether he gets into Pakistan's top engineering university. For months he cycled through quiz apps, and they all had the same flaw: they'd generate questions, he'd answer them, and the app would forget everything by the next session. Nobody remembered what he got wrong. So he kept losing the same marks twice.

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