What are the criteria for a branch upgradation at DTU, NSIT, and IIITD?

Instead of branch upgradation, I would like to call it branch change/ transfer. As an alumnus of IIITD, I can tell you about the procedure for branch change in my college-

1. CSE, ECE, CSAM, CSS, CSD, and CSB are the six branches available for branch transfer.
2. Because some courses start differing from 2nd semester onwards, the transfer takes place after semester 1.
3. After semester 1, the admin office sends a notification to all the students along with a form in which they can highlight the branch to which they want to get transferred.
4. Your JEE Main rank plays no role during the branch transfer. Instead, your CGPA decides your fate. Few courses, however, have a grade requirement (B- or above accordingly).
5. Every branch can see an influx/ outflux of 10% of its original strength. For example, if CSE originally had 120 students, 12 can enter it and/or leave it for that batch.

This is the process for branch transfer at IIITD. I would suggest you also talk to the seniors and refer to the official website of IIITD to see if any new changes have been made to this procedure.

Also, to find out about branch changes at NSUT Delhi or DTU, I would recommend you talk to the alumni and administration of both these colleges.