JEE Advanced is the sole gateway into India's 23 IITs, open only to candidates who rank among the top 2,50,000 in that same year's JEE Main and capped at just two attempts across two consecutive years — a far tighter window than most national entrance exams allow. Unlike many standardized tests that lock in a fixed format, Advanced's question types, section weighting, and even negative-marking rules can genuinely change from year to year at the organizing IIT's discretion, making last year's paper an imperfect guide to what a current candidate will actually face. Both papers cover Physics, Chemistry, and Mathematics together rather than splitting by subject, and a candidate must clear individual subject minimums as well as an overall threshold to even appear in the rank list, with roughly 18,160 IIT seats allocated entirely through JoSAA counselling based on that final rank. Because Advanced is deliberately pitched well above JEE Main's difficulty to further separate an already elite pool of top performers, even candidates with strong Main results typically need dedicated, higher-difficulty preparation rather than assuming Main-level readiness carries over directly.