Hello,
Yes, you can change your branch after first seat allotment in two ways.
1. You can participate in second phase counselling and select the institutes offering CSD or CSC course. You may accept the seat allotted in first phase counselling and participate in second phase counselling. If you are allotted a seat in second phase counselling then the first seat allotment stands cancelled. If you do not get admission in second phase counselling then the first seat allotment will be retained. If you do not accept the seat in first phase counselling and if you do not get seat in second phase counselling as well then you wouldn't have any seat in your hand.
2. You can apply for internal sliding in the institute. You have to accept the seat in first phase counselling and join. You need to get in touch with the college admission officer and request for internal sliding in the preferred course. If there are any vacant seats in the preferred branch you can change the course. If you do so you cannot avail for fee reimbursement if you are eligible for it.
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