I would think that now RAAF fighter assets are being deployed in a combat role for the first time in living memory (don't shout me down it's just a generalisation) that competition for entry will be extremely fierce.
That said the RAAF can afford to be even more selective. It's recommended that a student begin preparing for RAAF selection in year 10 in order to meet requirements upon finishing high school. An enormous ask for a child, but they are the ones that are ultimately successful.