BF - there was a reasonably concise post on page 4 of the thread which should answer your question. Practice your maths and reading comprehension as much as you can. Also, go to the Qantas web site and track down their psychometric practice leaflet - just concentrate on the maths and verbal only - that will give you a taste of what to expect.
LB - it should be in the vicinity of 10-14 days.
Good luck!