hi,

in generally students who have studied bsc courses on physics atleast of duration of 3 years and have studied mathematics as a subject in 10+2 course are eligible to apply for msc in physics course, now according to jam 2020 criteria, students who have studied  Physics for at least two years/four semesters and Mathematics for at least one year/two semesters in graduation are eligible to apply in iit jam exam. follow the below link to know in details,

http://jam.iitk.ac.in/doc/JAM-2020_MEQs.pdf