Ok. Well. I got A* at GCSE with nearly 99% of the marks, found it really easy and the maths was useful, thus interesting.
I'm just finishing A level and leaving with roughly a C/D. Basically it was the worst possible choice of course, especially if you have to do it with Edexcel. The entire course is completely irrelevant to anything, ended up skipping all the lessons since they were so dull and pointless and basically dropped the subject - still sitting the exams just to get the full A level and using my other 3 subjects to get A's.
For C1, C2, M1, C3 I got B, C, B, E respectively, statistics was relatively easy but C3 and C4...just no, no, no, no.
Unless you really need it or your school doesnt use edexcel, then keep as far away from it as possible.