The current format of recruiting as I know it is as follows:
Phase one: YOU
General aptitude test
Maths test - up to yr 10
ADFA officer entry test - this is only for people going for ADFA, and tests you on yr 12 math
Phase two: specialised aptitude
Instrument test
spatial skills tests
maths tests
hand-eye co-ord
Phase 3: Assessment day
Medical interview
Psych interview
Recruiter interview
Essay writing
Phase 4: FSP+OSB