TheFirstDohrnPilot, if your math problem is not regarding arithmetic cores, then you don't need to worry. I am in your same boat: I have always been terrible and have always argued with math.
Obviously I have no problems with arithmetic and to be good in mental calculus we just need to train a bit everyday. Even the game Brain Training for Nintendo would be enough
Calculate a tangent plane is not impossible too. I know a 737 pilots who - like me - has never studied trigonometry and learnt what he needed during his training.
The physics cores required to be known are not hard at all and sometimes Wikipedia is more than enough.
Just work hard towards your target and you'll make it!