OASC interview ?
Ok, lets start again !!!!
Is this for a filter interview at an AFCO or a selection interview at OASC ?
At any rate, it will normally be divided into three parts. Your background, your service knowledge and then current affairs. The service knowledge will involve all things RAF, where we serve, aircraft types etc. If you dont know something .. say, dont try and BS your way out of a question. These guys are pros and can spot BS a mile away !!
In regards to current affairs, hopefully you have a basic knowledge of what is happening in the world. ie) Iraq, Afghan, etc. A favourite question is they will ask you to take them around the world over the last 12 months. Try and have a news item from each continent at least. Dont just focus on the really obvious ones like Iraq as if its obvious you know, they will move on. Start reading 'decent' newspapers and watching the news everyday until your interview.
Most importantly, dont have an attitude, be respectful and be honest. Failure to do so and it will be over before its begun. Good luck.