have just done the OASC bit with a positive result.. the best advice i can give is to enjoy yourself.. go in with the mentality that it is gonna be stressful at times but you are there to have fun! stand up for yourself, my impression was that the whole process was designed to put you under pressure, especially the interview. If you do not agree with what they are telling you about YOUR life, then tell them and give a reason. remember that you are the one that has lived your life, not the sqn ldr in fromt of you!
In the syndicate ex's, play the game and support your syndicate members, and they will help you back on your lead, but also dont be afraid to say something if you think they are being thick!
good luck and enjoy yourself
