After you register, pay, fill, and lock your choices in round 1 of counselling, you will either get a seat or you wont. Fortunately, if you get a seat in the first round and you decide to take it, you can still participate in the second round of counselling (for up gradation). If you get a better college, you can take that seat and leave the first one.

But if you dont get upgraded you will still have the seat from the first round (remember, it was up gradation because you took the seat in the first round).

If you decide not to take a seat in the first round, or not attend the first round altogether, you can always participate in the second round of counselling.