IAT is a national level entrance examination conducted every year. There are a total seven IISER institutions in the country, exam qualified candidates will get admission in institutions of IISER. Shortlisted candidates will get admission into various IISER i.e. Bhopal, Kolkata, Mohali, Pune, Berhampur, Thiruvananthapuram & Tirupati. https://www.sciastra.com/blog/iiser-aptitude-test-2025-check-registration-eligibility-pattern-syllabus-exam-date-preparation-other-details/