C2 can have some very hard geometric series questions (like the 2014 paper), or easy, like imran_ said. Like you I predicted I got at least 54 which is a low B (72%) not too happy with it. I mostly screwed up because that C1 exam had things I have never dealt with before. For example the 2^x=y, 4^x = 2^2x (I got that far) but I didn't know you had do (2^x)^2
2^x=y therefore 4^x = y^2
That also meant I got the next question wrong.
Remainder theorem and dividing polynomials is easy though, a guaranteed 7 marks. So is binomial expansion. Just be aware of geometric series, logarithms and those damn circle questions!