Hi futureaviator,
Skytest is good for Eur70. It requires a joystick and rudder pedals (recommended but not mandatory). You'll just have to get the one that will help you in the future assessment (i.e. Compass, Pilapt, DLR). However if you don't know which type of test is being used by the company/school you are going to, then you'll have to choose one of them. Even if the test is not the same, you'll find that practising these tests will help you sharpen your mind. However, as I said in another post, if you don't have the aptitude, you can do all the tests on earth, you'll be none the wiser.
If you search hard and have a lot of time, you'll find a lot of these psychometric, maths, physics tests on the internet, but what Skytest (or the other ones) do for you, it's that they package these tests in one easy structured interface where you'll find all of them.
I have purchased the Compass one and had no problem in using my credit card. The company is a serious one. They send you your activation key in your email, you just download the software and activate it.
Have a good time (specially with the cube folding exercises
) and good luck
