Well from what I have experienced, Military Aircrew aptitude tests are hard, but they are bound to be, they are designed to filter out the less able.
In regards to the Civvy Airlines, I'm afraid I can't answer that for you, but I have recently applied for NATS ATCO, and looking at the Aptitude tests for that, it looks B***** difficult.
A flight school? Aptitude Tests? I've never heard about that? Unless you mean a Sponsorship flight school?
I currently work for a Flying School, and there are no aptitude tests.
I know that not many people have what it takes to become a fighter pilot but how hard are the apptitude
Well spelling for one is deffinately an a
ptitude test.
In either career that you opt for, best of luck.