Tim Cook answered
The best place to start looking for a practice test for the WIA exam is with the Wireless Institute of Australia themselves. Go to wia.org.au/licenses/foundation/trialexam for a trial exam paper.
If you wanted to take the exam this year, you may need to hurry, as the last exam sittings for 2014 take place in late November. The advanced and regular assessments will cost around $80, the practical test $75, though there a discounts if you are already a member of a nationally recognized radio club.
For more advice and tips, go to mara.org.au/online-resources, or contact the WIA national office on (03) 9729 0400.
YouTube users have a variety of ways of preparing for tests and exams. Here's one from Long Beach City College, USA: