The IISER Aptitude Test (IAT) is a computer-based entrance examination in India for admission to undergraduate programs offered by the seven Indian Institutes of Science Education and Research (IISERs), along with Indian Institute of Science (IISc) and Indian Institute of Technology Madras. The exam has an acceptance rate of roughly 1-1.5%, making it one of the most competitive exams in the country, comparable to IIT JEE in terms of selectivity. It serves as a gateway to India’s top research institutions, particularly the IISERs and IISc, which are known for their strong emphasis on fundamental science, rigorous academics, and a research-driven environment focused on building future scientists and innovators.