JoSAA

First prefer towards NITs then IIITs. All the best for your future.

For IIITs and NITs, you have to report at the nearest reporting center that is mentioned in brochure, i.e. may be NIT or IIIT. Yes, you have to report and pay fee.

You might have to go to either of these locations:
1) Malaviya National Institute of Technology, Jaipur
2) MBM Engineering College, JNV University, Jodhpur

Reporting for the first round is in between 28 June to 2nd July. Seat allocation is on 27th June. Therefore, you can't go for reporting on that day.

It is not necessary to lock, it's automatically get locked.

If you get seat in 1st round, then you have to report. You don't have to submit any original documents but yes the photocopy one will be taken.

You can change your choices before automatic lock by JoSAA or by you. JoSAA automatically locks the choice fillup at the specified end time. So before locking you can edit, add, delete, update your choice fillup. After locking you can only change the preference order but that's only after 1st round.

Based on last year's ranking cut off, there is a good probability of you getting into Production Engineering, EEE, Civil Engineering, Chemical Engineering or Chemical Engineering (Plastics and Polymer), Mechanical Engineering or Biotechnology branches at BIT Mesra.
You may also try for other branches at our BIT Patna, BIT Deoghar and BIT Jaipur campuses.