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I've gotten into several schools (with money) that I know I won't be attending as I've been accepted to my first choice. How do I go about withdrawing my application from those schools and freeing up that spot/money for other people? There are probably instructions or a form to return in my application packets/letters but I'm out of town for a bit so figured I'd just ask here.

Just e-mail admissions.

email, say "Thank you for your kind acceptance letter/offer, however, at this time I am withdrawing my application. Sincerely, me."