Dear Mohanraj,

In order to take admission in this college you have to appear for JEE Advanced exam.

You need to qualify for JEE Main exam first to be eligible for JEE Advanced exam.

To be eligible you should have 75% aggregate marks in your 12th class in general category and 65% in SC/ST and PD. 

To know in detail you can refer below link

https://www.iist.ac.in/admissions/undergraduate

Good Luck!!