Hi!
It is very tough to be a pilot. My cousin's son did not make it as a pilot but drives helicopter and he ferried PM Lee once!
Usually, a pilot trainee has to be the best in OCS - army unit or go into airforce during NS and be the best cadet. he has to be physically fit and very good in studies.
Usually, a student needs to take A Maths and pure physics and pure chem and get almost all A1s to qualify as a pilot.
But performance at NS is very important.
You may need a backup career - eg. aerospace engineer. It is also a very cool job as the aerospace hub will be fully finished in 2018. Many jobs will be available. Then you could get trained in some unis or institutes overseas after poly.(eg. Rolls Royce institute).
You could also take a junior flying club pilot licence in Sg or Johore. Your eyesight should be close to perfect.
Pls ask the counselors at poly for more accuate info.