Dear,

Most NITs allow branch change. Some of the NITs which allow branch change are NITK Surathkal, NIT Warangal, NIT Calicut, NIT Patna, NIT Silchar, VNIT Nagpur etc. The change of branch is permitted only to vacancies as per eligibility and category of admission. You may be allowed a change of branch, strictly in the order of merit subject to the limitation that the present strength of students in any branch at most can be increased by three.

Hope this helps!