various docs can be downloaded online.
What's your timeframe? You can only sit the written tests onshore (in Australia).
You can study/prepare before heading over, if you're not in Australia already.
I got myself Bob Tait's air law and human factors books for CPL, which (together with studying other docs) are the two exams needed for CPL to CPL conversion.
air law is open book exam, ie bringing tons of docs and finding reference and then interpret/realise what the legalese question is asking. The 'indexing'/highlighting etc has been restricted more recently.
I'd also recommend Heliwest in Perth. I had some delays/hiccups regarding my FI conversion (thank you CASA, NOT) so I havne't done the CPL bits as I wanted to do it together to avoid extra 10% VAT/GST post-CPL flight test.
AFT is also often recommended online. When I looked around for international postage, Bob Tait school was flexible and had it cheaper international postage (no GST for offshore destination).