TBH guys, there's not a lot more you can do now with preparation for the OAA aptitude tests. The only thing I could suggest would be to practice using flight sim at the highest sensitivity setting, getting used to correcting speeds with the throttle, climbing, turns, etc. FSX has a good set of tutorials that will allow you to practice those skills amongst others, and practicing all these skills at the same time should improve your situational awareness.
In any case, it's crucial not to overpractice, since you could get caught out with settings you have become accustomed to.