The National Testing Agency (NTA) has issued an advisory for JEE Main 2026 aspirants to update Aadhaar details, UDID cards, and category certificates before registration begins in October 2025. The exam will be held in two sessions: January and April 2026. Candidates are urged to ensure accurate documents to avoid rejection. Official updates will be available at nta.ac.in and jeemain.nta.nic.in.