You can contact your states http://www.dsr.wa.gov.au/
sporting body, or you can go through the MAIA (Martial Arts Industry Association) http://www.maia.com.au/
who will charge you 4 times the cost. There are also other ways, such as the international college of kenshusei http://www.kenshusei.com.au/
but this is like a uni degree for martial artists & will probably cost you a whole lot of money.
Hope that helps