Hey,

One can get into IISER through KVPY, JEE advance, SCB. Candidates belonging to general category need to secure a rank within 10,000 in the Common Rank List (CRL) of JEE Advanced to secure a seat in IISER. The only gateway to enter IISER through SCB is by qualifying the aptitude test conducted by them. 

You can follow the link below for deeper information

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

Hope this helped you 

Thank you and keep asking:)