Dear Aspirant,

Choice filling has to be done very intelligently. You should place the seat with your highest priority first followed by other seats with lower priority one by one. The best ones should be at top while the ones that you don't prefer much should be at end. Once choice filling duration is over your preferences are locked. If you get the first preference from your list then the seat is automatically freezed and you cannot go for further rounds. So always place the colleges with your highest preference and priority at top and then the others with decreasing preference and priority one by one. Complete this job wisely with a calm mind.