Karhu
As what most people have said the biggest way around the psyc is honesty!, honesty! honesty!. Thats there job, to weed out the ones who are insecure and are willing to lie. But you wil probably have noticed that there is more to the interviews than just the psyc theres also the knowledge and maths. Good tip for mutiplications.. Say 14 x 13...mutiply the 4X3 if theres any remainders then add that on to the total of 4+3 and add the first digits. So.. 4X3 = 12..3+4+1(carry the ten remainder)=8 and 1+1 =1 so equals 182..Sorry if im confusing you it took me a while to figure it as well but it takes the pressure of things. Also if you get in to say flight screening be careful, your always been watched! Try to be cool and don't be the odd one out! Also as what happened to me, the psyc had a real go at me for only being 17 and what I was doing away from my mum! But whateva you do don't let it get to you, even if you have the urge to kick his ass after the interview, it's all part of the deal.
Good luck
Bodie