Dear Aspirant,
It is quite hard to predict the exact situation as it depends on the number of students attempting the exam the preferences of the students and the seat matrix of the college.
IISERs don't release official cutoffs and hence the predictions are based on the experiences only.
There are about 1300 Seats in IISERs reserved for IAT Candidates and about 250 seats are reserved for OBC NCL candidates.
Looking at this we can say that it is quite difficult for you to get into IISERs. A 3 digit OBC NCL rank is a safe zone to be.
Yet, you should keep an eye on the counselling as there is a very small chance for you in post allotment rounds. Students drop their seats at IISERs after getting into engineering and medical colleges.
Please check the link below for more details.
IISER cut-off
Hope this help
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