I've just been through OASC for raf selection. I wasn't selected
. I have some info on the aptitudes on my website
www.timc.clara.net though there probably isnt any more info on there than youve already received. Personally I thought the test for pilot was fairly easy (I got an excellent score, but I wasn't applying for pilot!). Just know what the different instuments mean and the digit recall one gets quite hard towards the end, was about 15 digits at the end!
Good Luck!
