Best advice I could give you Carambar is:
1) Make sure your Maths/rate conversions/shortcuts are tip top.
2) Find a good ATC simulator and practice.
3) Accept the fact that you can't really train for it so, you either have 'it' or you don't.
ASA kept their hand close to their chest on the scores required to advance. That is they didn't tell us a thing. All they said was that you had to pass every test which helped in now way at all as we had no idea what a pass was. You don't get your scores even if you get through.
I'm not sure what part of the recruitment phase I would consider the hardest. Probably the Psych Testing, only because I had absolutely zero idea what to expect.
Good luck.
