AI use ups homework scores, but slashes exam marks: Study

âLLM users show lower cognitive effortâ (representative image)

NEW DELHI: Evidence cited by World Bank suggests that unrestricted use of generative AI can improve what students submit as part of classwork while weakening what they actually learn - a warning with implications for countries such as India.World Development Report 2026 devotes a section to 'Generative AI and the Erosion of Knowledge, Learning, and Human Skills', cautioning that tools such as ChatGPT can reduce the mental effort through which reasoning, writing and knowledge are built.Its strongest evidence comes from China. A study covering students in classes VII-XII found self-reported AI use rising from almost zero to around 80% between 2022 and 2025. Six months after its first use, homework scores improved 18% even as students spe-nt less time on assignments, while monthly in-class examination scores fell 20%. Students who had ever used AI also scored, on average, 5-7% lower in senior high-school and college entrance exams.The report cautioned that the study had not yet been peer-reviewed and reflected the early phase of AI adoption.Gaurav Nayyar, who led the World Bank team that prepared the report, said the evidence points to both opportunity and risk in education.

"If students outsource the learning process to AI, then... that will be a problem," he told TOI.He said the evidence so far appeared more encouraging when AI was used by teachers rather than directly by students, pointing to its use in personalising and customising instructions to suit different learners.

Other research reviewed by World Bank points in the same direction. Participants using large language models for research displayed lower cognitive effort and weaker reasoning, while studies found mental effort declining even when output quality improved. Students given unrestricted AI access also performed worse later when the technology was withdrawn.The report warns that if students use AI to complete homework, the "productive struggle" central to learning can disappear, potentially weakening foundational skills in reasoning and writing.But it does not argue against AI in education. A synthesis of experiments across China, Ghana, Nigeria, Turkiye and US found that 30 sessions of AI-powered tutoring produced learning gains equivalent to at least 0.5 years of schooling, particularly when AI complemented teachers and included safeguards against shortcuts. "AI can augment human capabilities," the report said, "but it must not replace the processes through which more advanced skills are acquired."

Manash Pratim Gohain is a seasoned journalist with over two decades at The Times of India, where he has built a rich body of work spanning education policy, politics, and governance. Renowned for his incisive coverage of the National Education Policy (NEP) 2020, accreditation reforms, and skilling initiatives, he has also reported on student politics, urban policy, and social movements. His political reportageâboth reflective and news-drivenâadds depth to his writing, bridging policy with public impact. Through his 2,500 articles and related outlets, he has emerged as a trusted voice in national discourse, particularly in linking education reform to broader societal change.

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