Well no wonder your having trouble, IB is really hard, i remember IB bio kicked my butt. For those of you who dont know IB is sort of like AP classes.

I think math is mostly something we cannot change (im not going to say genetic), but it is in the way we think, how we get from A -> B. And while it may be hard to do, but i think you can get better at it, as vashti said get a tutor and it will be a piece of cake.