Hey!

Yes you can change your course. But, firstly you have to withdraw your name from that course in which you have taken admission.

Also, you can choose only those courses which you have filled in your online UG form.

Also, do check your cut off for that particular which you want to choose before canceling your admission in previous course. And make sure that you change your course within given time.

Once the admission process is over, then you cannot take admission in any course or college. So do everything accordingly. Keep a check on cut off lists.

All the best!