Firstly, very well done. They're not easy courses to get onto (with the warning, that they're even harder to graduate from)
From my, now rapidly receding, experience of an Aero-Eng degree I'd suggest...
- Algebraic manipulation, the better you are the easier it'll be for you.
- Calculus - numeric and analytic differentiation and integration, solving first and second order differential equations.
- Mechanics and Dynamics - the usual Newtons laws, pinjointed structures, rotating things, vector algebra and associated 2D and 3D trig.
Those are the biggies, with stats, complex number theory / manipulation coming joint second.
G