Priya for which entrance exam you are enquiring about. Please state your exam, your rank in that exam and your domicile with your reservation category if you have one. That helps us to give you a detailed answer. If you are talking about JEE,  then I would advice you choose colleges according to your rank and last year cutoff. If you choose top colleges with a lower rank you would miss chance to get a college which you could get if chosen accordingly.