Work & marketsChina+4 clusters01
AI made homework faster while exam performance fell
A 30-month study of 26,811 Chinese secondary-school students estimates that generative AI raised homework scores by 18% and cut completion time by 30%, while monthly exam scores fell 20% within six months and high-stakes entrance-exam scores declined over longer exposure. The losses were concentrated among the roughly 80% of AI users whose unusually fast, high-scoring homework suggested that they were outsourcing the work rather than using AI alongside sustained effort.