Hello Aspirant!

Joint Admission Test for MSc (JAM) is an all-India online entrance exam conducted by Indian Institutes of Technology (IITs) each year on a rotational basis on behalf of Ministry of Human Resources Development (MHRD), Government of India. IIT JAM exam is conducted in seven Science subjects (also referred to as test papers) in order to provide admission to candidates in MSc and other post-bachelor courses offered at IITs and integrated PhD courses offered at Indian Institute of Science (IISc), Bangalore . Several National Institutes of Technology (NITs) and Centrally Funded Technical Institutes (CFTIs) also accept JAM scores for MSc admissions.

Hope this helps you  :)