Cheers for all these answers,
I have already got the AFT book and they're OK but I find that sometimes they assume you know all the abbreviation in Aussie aviation and which book to open for whatever question.
Same thing with human factor I think they assume you already know quite a lot, less of a problem in my case since it was similar to the FAA and JAA HF but if you haven't study the material before (supposedly the same material is used for PPL training) you might struggle to understand it all.
I guess I'm stuck just "learning questions" instead of trying to understand when to open which book (although you can get quite far with just the AIP).
I thought the flying in Australia was simpler!