The procedure for filling of seats in NIT’s has been changed as compared to the previous years.The seats in the NITs shall be filled up with following criteria:

1. 50% of the seats in an NIT shall be filled by the eligible candidates who have passed +2 examination from the State in which the NIT is situated. For example, in NIT Agartala 50% seats shall be filled by the eligible candidates who have passed their +2 examination from Tripura.
2. Admission in NITs for rest 50% seats would be on All India Merit basis. For these seats candidates would be admitted from amongst All India rank holders in AIEEE.

Just check out the counselling schedule here- http://ccb.nic.in/CCB2008/CounsellingSchedule.htm and check the number of seats in each college here

For more info about it visit here http://ccb.nic.in/CCB2008/welcome.html