Dear Aspirant,

Following are the ways to get into IITs:-

JEE ADVANCED:- Admission into Bachelor course in Engineering and in few cases bachelor of science courses.

GATE: Admission into masters course in engineering, Mtech. This is the test after the graduation.

CAT: This is for the admission in the master course in management, MBA in Some IITs. This is also a test at the graduation level.

Hope this helps. Thank you.