There have been a lot of cases when students have changed their branch after the first year. My brother from RGPV did the same when he was pursuing PCT. He changed his branch from PCT to EC. 

• Well, the important thing which you should keep in mind before changing the branch is that you should keep an eye on the number of vacant seats offered by the college.
• The students from any branch are allowed to change to any other branch. Such as a student from CS can change his branch to automobile, EX to CS, or PCT to EC.
• The only thing you should take care of is maintaining a good grade, for switching branches.

Thus, you are all free to change the branch if you fit the criteria of changing a branch.