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You can fill out the FAFSA at any time, and you can list each of the schools you were accepted to in the application. I am not sure if filling it out sooner increases your chances of receiving any financial aid, but I would still recommend doing it sooner rather than later if you can. I would check with each individual school to see when their priority deadline is. I filled mine out about a month ago and received an email from my school a few weeks later that it was received and I will hear back about any financial aid in March.
