Hey Sathya,

JoSAA (Joint Seat Allocation Authority) is a counselling authority which is set up by the MHRD (Ministry of Human Resources Development). JoSAA conducts and manages all the counselling related activities for admissions in IITs, ISM, NITs, IIITs, NSITs and other GFTIs

To Register go on the official site of JoSAA:

www.josaa.nic.in

Hope so this answer works!

All the best Dear!

Keep smiling :)