Hello Swati, the seat you have got in round 1 will remain with you unless you are offered a seat in the next better college. The seat stays till the last round, but will be alloted to someone else if you do not freeze it.

after each round of counselling, if you are provided a seat, you have to choose one option out of slide, float or freeze. It doesn't matter which option you chose in the previous round. Float is the most recommended option.