Cazatou's advice re current affairs remains relevant.
Add in Flight International and Aviation leak and you will be well up.
Express your opinion (your own, not what you think they want) and be prepared to defend it.
They are looking for someone who can think for themselves, argue their point without being obnoxious and recognise when they have lost. They are not too bothered about what your opinion actually is - if you were of a politically undesirable persuasion you would not have cut out the coupon in the first place.
And, at 17 and a bit, without prejudice the odds are that you will fail. Don't be downhearted, they will be delighted to see you back in a couple of years with some serious growing up done.
OTH, if you succeed at this point, you will be front line at 20, formn leader at 22, QWI at 24, promoted at 27, Sqn Cdr at 31, Staff college at 34, Staish at 37, * at 40, ** at 41, *** at 45 ...
Sir!
Sven
If you want to discuss privately, PM me. Still in, still a Flt Lt pilot after 29 yrs.