Jinkathoti, 

First is IIIT HYDERABAD. Mode of admission is

One can get admission through JEE (Main) exam, or by writing a separate exam conducted by IIIT-H. One must separately apply for IIIT-H counselling.

Second Is IIIT BANGALORE. Mode of admission is

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

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

Hope it helps