Is there any change option of seat for 1st phase of counselling?

What change option you want. Do you want to change your course or want to change your college?

If you want to change your course, you need to inform in the College about it. You will have particular date to change your course. So inform before it's done.

If you want to change your college. You need to cancel your admission if already submitted documents and again apply in the next counseling. You need not register and just apply.