I think with maths no matter what level you are, you always want to 'improve'. I don't think you can ever honestly say 'I know everything in maths'. I think I gained a greater appreciation of maths by redoing more and more questions. I've been called 'weird' by people in the past, in that maybe I put my study ahead of my social life, family but it's just in my blood. I do questions, test papers, text books of all sorts and I actually live for maths, breathe for maths and it might not be a great level compared to other people, you can get called 'strange' or 'geniuses' by people who think you have an addiction to something.