Greetings Sanjay,

I am providing you the detailed percentages of the boards for IAT 2019 and also for IISER:

1.CBSE:88

2.ISC/ISCE:93.3

3.ANDHRA PRADESH :94.8

4.BIHAR:70

5.KARNATAKA:88

6.HARYANA:85.5

7.GUJRAT:60.2

8.WEST BENGAL:75.9

These are the peecentage required for admission in IISER.

Good Luck!!

Regards Ankit!!