OK I cannot give you all the answers since I was taken on in there PASTS sponsership but ill give you some handy pointers that are relevant to lots of places.
Practice your maths without a calc, long devision, adding, subtracting, speed and distance equations.
General knowledge on aircraft flight eg, lift, drag etc.
You will get a moresby style test but it wont be the moresby one as they used something else when I was there.
If you make it to the last interview stage you will get a tough interview, and a flight test either sim or real depending on the sim.
That flight test well its a couple of circuits and showing that you have improved and that your standard isnt bad in the first place.
Good luck