Dear Bipattaran,

IISER takes admission through KVPY, JEE Advanced and SCB channel. 

You are applying through which channel?

You can refer below model test paper to get an idea through SCB channel

https://engineering.careers360.com/sites/default/files/IISER-Model-Paper-1-English.pdf

https://engineering.careers360.com/sites/default/files/IISER-Model-Paper-2-English.pdf

https://engineering.careers360.com/sites/default/files/IISER-Model-Paper-1-Hindi.pdf

Good Luck!!