Do well in your mathematics.
Start playing a few flight sims to develop hand-eye-coordination
skills. Also, it helps you gets used to the different
orientations an aircraft like a fighter might find itself
in.
Stay physically fit, because pulling-9Gs require you to be
fit.
Sharpen your situation awareness. Try to keep a mental
picture of ur surroundings in your bus rides. Whenever the
bus turns, do an orientation check. In an aircrat, it gets
trickier, cos movement is now in 3 dimensions.
Have fun, and all the best.
what do you mean by orientation check?