Andy,
Pro pilot don't generate failures to your aircraft. If I remember correctly most of what you get marked on has to do with following common rules. Remember to turn on landing light before take of, remember to turn them of above 10.000 ft, remember to turn them on again under 10.000 ft. remember to reset the pressure when passing 18.000 ft.
I think this is where the most mark downs comes from.
edit: And what ever you do, don't crash in any way.