Don't freak if something doesn't make sense for a while. (If you're doing a maths degree, get used to the feeling you'll probably be getting it a lot from now on)
Don't get bogged down, sometimes the best explanation for you is elsewhere in the chapter/module. Plus the same rules crop up in different contexts.
Get all the cheap early marks you can if you want a good grade (I had TMA scores of 40 and 73 and still just scraped an 85% OCAS thanks to big early scores and substitution)
I read quite a few complaints about over-pedanticism, restating the obvious and the like but in my own experience everything they want for a TMA answer is important even if I didn't think so at the time.
And racking up a good exam result without really understanding what you are doing is very achievable. Last year's M208 exam was easier for me than this June's 221 paper (but I did a lot more revision for 208 and got two perfect S2 questions)
There are a bunch of older M303 ones here if you want any discussed/solved I can probably do the non-calculus ones (there is little calculus in 208 anyway)
2006 has disappeared from the web shop but as far as I can tell it's still not legally distributable.
The 2005 paper linked above is a decent guide. Ignore flows, mobius transformations and possibly a few other bits, but the group theory, linear algebra and analysis are represented and many questions very similar in style. The questions are very similar across years. You do get a single specimen paper with marking scheme + solutions with the course materials.