Have you done the aptitude tests Aero? Having gained competitive scores for every branch after doing a lot of maths preparation I'd certainly say that maths practice helps and is something that you can easily "train" to perform better at.
However a large amount of the aptitude you just couldn't practice without sitting the test itself multiple times. I used a Nintendo DS "brain training" game during my preparation and played a flight sim game with a joystick etc which I certainly would recommend if you don't have flying experience as visualising objects from different perspectives (such as planes) and reading instruments does feature in the testing.