Hello,

IISER 2020 cutoff will be based on various parameters like numbers of appearing candidates, total number of seats, the difficulty level of exam and the last year admission record. IISER cutoff is based on the state board, CBSE board, ICSE board.  You haven't mentioned your Board but considering your board as CBSE then you need to have 88.3 % to get admission in, and state board have their own cutoff %.  There is also 5% cutoff relaxation will be provided to OBC(NCL).

For further information you can check this link below:-

https://engineering.careers360.com/articles/iiser-merit-list-and-cutoff/amp