What if the MD school is UMKC which begins classes in January, effectively forcing applicants that only have an acceptance from them to enroll and begin classes there. Would other schools still accept students that already began classes there?
Absolutely not. I am not aware of any US MD school that accepts transfers, other than under very unusual circumstances. Wanting an upgrade after 6 or 18 months would not qualify as one of them.
Med school is not like UG, where musical chairs is common. Whether it's UMKC or wherever, your choices once you enroll are either to stay or withdraw. Transferring is not really an option, and pretty much no US MD school will touch you once you have enrolled at another one, whether or not you have withdrawn first.
UMKC is a very unique case, since the vast majority of their class comes from their BS/MD program, and the seats they are filling are created by attrition from that program. The odd start date no doubt correlates with what they are doing with their BS/MD students, so new students can seemlessly join a class already in progress, and is no doubt also designed to avoid competition with all other US MD programs. If it was possible to do what you are asking about, they'd never be able to keep those seats filled!
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The rule of thumb is to not go anywhere you will not be happy. There is no exception for UMKC and its January start date. Everyone who only has one acceptance, no matter what school it is, is forced to enroll and begin classes at that school if they want to be a doctor.
There is a tiny window for people who start DO early to withdraw and enroll at a MD school if they are lucky enough to have that opportunity, since MD and DO schools do not have a common system through which to communicate with each other. The same opportunity simply does not exist between two MD schools, and certainly not 6+ months after enrollment.
If you don't want to be "stuck" at UMKC, don't apply. Around 60,000 people manage to resist the urge every cycle!
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