Midnightsky,
The wombat test is NOT the JKI test. The JKI test is the multiple choice technical test based MAINLY on the JKI booklet. Most (if not all, correct me if I'm wrong) applicants do the JKI test in stage 1.
As for the technical questions, I suggest you continue reading this thread. There are hundreds of examples of technical questions many kinda people have outlined from their experience. It will be a good general guide to the type of questions you may encounter during the interview and the degree of difficulty.
good luck on your interview.