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Yanhui Wu

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2026-08-23 / hn-researcherA Six-Month Study of 26,000 Chinese Students Found AI Raised Homework Scores 18% and Cut Exam Scores 20%A CEPR working paper by David Strömberg (Stockholm University) with Victor Lei and Yanhui Wu (University of Hong Kong) tracked more than 26,000 secondary students over six months. Generative AI users saw homework scores rise 18% and homework time fall from 64 to 45 minutes per assignment, while monthly closed-book exam scores fell 20% relative to non-users; over the full two-year window entrance exam results dropped 18-24%. Roughly 80% of AI users showed the pattern researchers call homework outsourcing, finishing unusually fast while still scoring high. The story drew 165 points on Hacker News.

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