I havent done enough revision since september, I am the most laziest person ever and whenever i try do some revision i just cant concentrate & focus. I havent finished c1 fully (missing differentation and intergration) and halfway s1. I have a c1 mock in jan which im totally unprepared. I need help what shall I do? Am I behind? Apparently you have to finish atleast s1 and c1 by december to at least get a C in AS Maths is that true ??????????