Hi Maahi.. :)
I don't think studying 24*7 would surely fetch you a seat in any college. You must relax and do the things which you enjoy, apart from just studying all the time.
Don't be stressed about the number of seats and all..If you'll do the hardwork, you'll definitely get through a good college. But if you'll think negatively then the motivation and incentive to work hard goes down. So, better BE POSITIVE and give your best shot.
Also i would suggest to make a schedule of things which are to be done for entrance and which are to be done for your college studies. And do follow it.
Smile!! :) :)
:)