Best of luck to you all!
If it's any consolation, I came out of my selection tests some time ago, absolutely convinced that I'd failed (the computer based tests in particular).
I must have done okay, though, 'cos they let me in!
Don't worry about needing to know exact seating configs, or exact speeds, or stuff like that. As long as you know roughly how fast, high, far etc different classes of plane go, you'll be okay. If you know you can't get 240 pax across the Atlantic in a PA28, you're sorted. (Oh, and any question about hot-air balloons, think very carefully before answering......)