Probably not in July. Check the AAMC traffic rules, but as I understand them...at this point in time, before you are offered an acceptance, the school potentially offering contacts the school you are currently holding. At that point, they confirm that you have not begun classes there. If classes have begun, then the new school does not make the offer. I'm becoming more and more convinced that Finch's early start date is purely designed to force people into matriculating.