kspin, im sure you will be fine! if you are even reading 1 newspaper a day then you will already have a sound basic knowledge. Just relax and be confident, think about current issues and have a few of your own opinions not just what the papers say, they like that!
Ive just discovered the debate section of this website, its very good go on there and just read other peoples opinions, it will be good practise for the debate!
With OASC if you are keen, clued up on the raf and know about yourself you will be fine in the interview, you know what they are going to ask you so just work through it and learn it, easy! the other part just be confident dont be afraid to push yourself forward thats where i failed.
I ahd the dilema about my medical form had a riding accident 4 years ago and suffered headaches afterward but thought had better put it down in case it may effect my working ability. they were fine about it and i had a chance to discuss irt. they access your doctors notes so anything you try and hide will come and and look much worse!