For everything you need to know on the WOMBAT testing, I suggest you go to this website.
If you can familiarise yourself with it now, it really helps.
Remember the task on the main page is your primary task - always monitor it.
Then hop out to do bonus questions when you can whilst ensuring the primary task is on track and not failing. (It'll all make sense when you do it).
Good luck!
http://www.aero.ca/e_W_CS_Scenario.html
