dear aspirant 

After seventh round your seat will be auto frozen and you will not be able to withdraw admission after 6 round.You will have to report physically at the reporting center for admission at the institute allocated to you after the 7 round.There,you will need to submit attested photocopies of the documents given on the sites or various colleges (check the institute site allocated to you).Fee payment of campus as well as hostel fees payment will be done at that time only .An intersecting point is the spot round which can be a deal breaker this time ,this round will give an opportunity for all the candidates to refill there choices and they can get a chance to upgrade their college or branch .It will be done on first come first serve basis .

best of luck.