Dear aspirant,hope you are doing well.

now coming to your question,if you have attended the 2nd councelling round then you can't go back to the first councelling round or take admission in the college which was alloted to you in the first round.So you have to now take college that you got in the second round or further rounds.If you want to have that 1st round college earlier,then you need not to apply for 2nd councelling and freeze that seat,but now you can't do it now.

hope this will help.