Hello Aspirant,  After getting the college in the first round you have to report to the college in the given date. If you failed to report in the given duration then your seat will be floated and seen as vacant for the other rounds. So you must have to report in the given duration. 

I hope this will help you 

Dear student, after getting college in first counselling you should report to the mentioned college for the purpose of document verification. You shouldn't wait for the second counselling. If you don't want that college you can apply in the second round counselling.

All the best 

Hope this helps