I'm going through exams right now, have to pass them all or I'm getting chucked out of uni! so I can relate to what you're going through to a degree.
as has been said resits are possible so it's not like if things don't work out there is no way to fix it. As for personal statement, I'd assume that doesn't need sending for a few months yet? so you could probably get a tutor to help you with it once you go back to college/school
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