Avinash, 

Mode of admission in IIIT BANGLORE

One needs to take JEE (Main) exam and separately apply for IIIT-B counselling.

Admissions are on the basis of rank in JEE (Main).

So you have to go the official website of IIIT-B and fill its counselling form they they will release the cut off rank/ percentile and if you loe within that range you will get admission. 

The official website link is

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.iiitb.ac.in/&ved=2ahUKEwiF9a7Q5KLiAhWNbisKHfMHCN0QFjAjegQIAhAB&usg=AOvVaw1O2FXKcscSw7D0X1z3Mo9-&cshid=1558103827885