Will I be able to change my branch in DTU/NSIT after the 1st year? If yes, then what is the criteria to change the branch after 1 year?

NSIT Branch change Rules

Branch change in NSIT happens after 1st semester. NSUT has unique criteria regarding branch change. If there are vacant seats in the branch of your higher preference(as filled during the choice-filling procedure of JAC Delhi) and your JEE rank is better than other students who applied for branch change, then your branch changed automatically after the first semester. However, if you have filled out the branch freezing form at the time of admission or students who got admission during the spot round cannot change their branch.

DTU branch change

DTU has no branch change policy. In rare cases, if someone from a higher cutoff branch withdraws his admission after the spot round then the seat is filled by those who opted for that branch and not froze their current branch. The chances are almost low though.