Accepted? Rejected?

If you get accepted in one of your top choices, great.
Now what?
Check if they offered any scholarships? If yes, then how much? Check your other acceptances, see how much money they give you. Compare them. Sometimes you can negotiate with schools to match scholarships.

You got rejected?
Thats fine, sometimes you can contact the school and ask for a reconsideration. It probably won't work, but it is worth a try.

What do you do with all the rejection letters? BON FIRE.

My last advice about this topic is that the highest ranked school you got accepted at is not always the best choice for you.
I say visit the schools, talk to administrators and see how you like it, then make your decision.