India, Sept. 12 -- Every three years the Organisation for Economic Co-operation and Development (OECD), the Paris-based grouping of mostly wealthy countries, sets the same test in science, reading and mathematics to a sample of 15-year-olds around the world. The Programme for International Student Assessment, or PISA, is the most widely used comparison of school systems. The 2025 round, published on Tuesday, covered more than 760,000 students in 91 countries and economies, and for the first time asked them how often they use AI chatbots to do their schoolwork.

Students answered for four uses: summarising a text they had been set to read, doing first-pass research on a new topic, drafting writing assignments, and a catch-all option, using...