Thanks for the replies,
I do happen to like physics, I just end up being rather poor at it when it comes to tests and the like (I probably lost half the marks on my test because of my poor handwriting, something I'll need to work on.)
Just checked on DefenceJobs, C Grade in Year 10 science is required for pilot, however the mandatory science pass for Year 11 is something I don't recall seeing for ACO before.
And my maths course is to their standard, at least. I just don't want to be disadvantaged by having a C on my report card, especially since I was planning to apply for ADFA.