If you're going for the aptitude tests at Cranwell, don't worry, There's nothing in them to catch you out, and you get plenty of practice at each one before you do it.
I've done the aptitudes for RAF, BA, BM etc. and never had a problem with any of them, so as scroggs has said, if you have the aptitude, you have the aptitude. Therefore if you can pass one set of tests, theoretically you can pass them all.
A couple of things you could practice for all aptitude tests are you mental arithmetic, and your short term memory (number recall skills), as I believe these are two areas a lot of people have trouble with.
Good luck with whatever you are going for.
