RBS if you are talking about initial Officer Aptitude and Specialist Aptitude testing then the ARCO Book is probably all you would need. Not really much you can study for as such, it really depends on your own abilities and problem solving skills; some of it is speed and accuracy tests (read and reproduce) but I would pay attention to aircraft attitude diagrams and visual refrencing areas, also do some study on speed/time/distance problems and also basic %, Decimal and fractional equations and mixtures of the same.
Age is not much of a problem for Army and may not be an issue for Navy but is for RAAF espescially if you want to fly the fast stuff....
