The National Autonomous University of Mexico (UNAM), the country's largest and most prestigious institution, has announced that around 58,000 students must resit its entrance exam after suspiciously high scores pointed to widespread cheating. The university had offered the test remotely for the first time this year to improve access for out-of-state applicants, but AI-powered anti-cheating tools failed to prevent fraud — with the share of students scoring 100 or above out of 120 jumping from 3.5% to 16% compared with previous years. The scandal prompted protests in Mexico City, a call from President Claudia Sheinbaum for a possible attorney general investigation, and an unprecedented halt to admissions at an institution where over 150,000 applicants competed for fewer than 22,000 places.