Andrew I don't know much about the system they use to employ people but I wouldn't worry too much about fine detail etc. At 18 another year on the sideline building up your skills to get through the testing when called up may be a blessing in disguise. Have you applied for Jetstar? Make sure you go for all opportunities and don't make the mistake we all made by getting tunnel vision on one job.
SenZub, can you do a bridging course? Long time ago thats what I did. 6 months one night a week, tick the box move onto next hurdle. All the best guys and girls see you in the seat one day.