In previous post on same topic i commented that as great as it might be you just cant prepare for tamworth.
you get put in a situation which demands high levels of performance at a very high rate of learning. It is not easy but when its all over it is the best 2 weeks ever.
I was fortunate to be in a group where we all got on very well. I think this helped everyone on the course. I back up the previous post, If you go into it treating everyone as competition and not a team mate then you will do worse. Thats all i can advise you of.
Enjoy, give it your best and you cant complain about the outcome. Concur about Navy/Army. Nearly everyone has RAAF as first preference. Unelss you score 3.0 or more I would seriously consider nominating RAN or Army as first preference.