Hello student, First of all Netaji Subhash Engineering College doesn't allow any branch change or branch upgradation even if it offers you can only get your branch change after your 1st semester that too on the basis of your JEE rank only. ECE is also a good branch and you can still switch your career according to your interest many students get placement in good CS/IT companies even after being in ECE. So don't worry.

All the Best!