Hellow Bhawna,

Every IISER has a different minimum rank every year depending on the number of applicants for getting an interview call letter.

You have low chances to get there but don't be dissapointed. IISER Mohali called everyone up for a written test, followed by interview for the select few. IISER tvm doesn't even ask for your JAM rank. The applications are available before JAM entrance. Also a piece of extra information- IISC also called students of rank above 1000 for an interview and have also selected someone in 900s this year.

All the best