Liquidhockey,
As far as sums go in the Principles of Flight (nearest to the old aerodynamics paper) there isn't that much of it. Just need to know how to work out load factor and rate of turn, that sort of thing. It's basically about remembering formulas in the ATPL's - even for General Navigation so I wouldn't get too worked up over it. People who haven't even got GCSE Maths pass them. That said you'll have to work very hard at it as there's a huge amount to learn!
Out of ten? 7.5
BM.