pagey

Could anybody give me any information on the wiring/trade test i have to take before i can work in Perth?
I am a refrigeration / air conditioning engineer and i have my visa .
I am going to Perth in Jan / Feb on my own (without the family) and i`m hoping to get the work visa / trade / wiring test done whilst i`m there so that when we all return a couple of months later , i can work straight away . I haven`t got a clue where to start , can i get a copy of the books required to revise , how much does it cost? any one with any info i`d be much obliged ,
Cheers