Are you flying GA or RAAus?
The latter has some scholarships to encourage young ab initio pilots and you can convert to PPL once you get your pilot certificate.
The AWPA also provides scholarships (mostly for women) but they like you to have your basic qualification first and will help with endorsements such as CS, TW, R, and aerobatics.
I have a young friend who is Captain on a SAAB. He did his PPL privately but then got a Cadetship with REX. Got an Instructor rating teaching other young pilots to fly with them and is left hand seat at 30. Make an appointment to speak to the team at Wagga and see what they have to say.
But do those studies - maths and sciences - and get stuck into studying for your PPL exams, too if you haven't got enough to to do.
Kaz