I played a bit of Call of Duty 2 and MS Flight Sim 2004 prior to my tests.
FPS games are really good for your reactions, and try and play some games that use a joystick as some of the actual Pilot aptitude tests require the use of a joystick.
p.s. The most recent great game I have played was F.E.A.R. If you haven't already played it, check it out!