Cambridge. Oxford. Shit. Suddenly I just feel like shutting up.
Anyway, wellcome to physics :P
At least where I am, I think at most 25% of people get the entire first term, and the chemestry class is kind of a joke.
But, yeah, studying through past exams can be really helpfull in most cases. I assume you have text books with you? You could try using old exams as a guide to study. If you can't solve a question or are not really sure you're doing it right look the subject up. I guess what I mean is try studying in a more practical way, as it's very easy to be overloaded with theory and technicalities at first which'll actually hinder you if you're not used to reasoning the problems out, which should be the first skill for you to seek.
Also, if you have to study for both math and physics courses, I'd say you focus more in math first. And really, don't get too desperate just yet, five weeks is a lot of time.
Oh, and you can't go to university and both fail and not get to know people, that's just not right :P