Don't worry about messing up A level Maths. I didn't do too well in mine, (ended up with C, but restarted after the first year). It's totally different to GCSE and a massive step up!
I failed it at AS at the first time of asking, but managed to get it up to i think it was B at the second time of doing it at AS. Somehow managed to drop to C at A level, which is a shame. My physics also dropped from A in January of A level to a C in the summer, so i think i must have just had a bad summer of exams
Still...the point is that like peopl,e have said, you don't NEED it, it's just really recommended. If you get through the assessment tests, you'll be fine, as they're there for a reason
