At GCSE I didn't get good results, mainly B's and C's. I got a B in Maths and a C in English language. In are recent mocks I got 4 A's. If I got 4 A's at as level, would that give me a chance to get in a Russel uni'?
if you want to do maths, you should aim for the best of the best if you want to get into a russell group!
Anyway russell groups aren't the be all and end all of uni's plenty of good ones that aren't russell groups :P
What degree are you thinking of doing and where?
It's also worth remembering that the Russell Group does not encompass every good university in the UK, and that not every Russell Group university is itself particularly good across the board.