I can't answer for the RAAF but I would be very surprised if it was very different from the RAF.
We dropped Logs from the basic navigation training 20 years ago and even then trigonometry was a closed book to many of the students to the extent that I had to write a simple example of trig so that they could understand it and use a calculator.
On the initial selection it is very much as you suggest, speed, times, and distance. Mental artithmetic and mental agility. Playing darts was often suggested as a means of sharpening up addition, subtraction and simple multiplication. Know you times tables and key square roots like 169, 256 and so on.
In other words, all pretty basic stuff but expected to be accurate and quick.