Amydunn,
Good advice from alphamaniac. Just read the material you are given lots of times and the motivation paper is easy, and as for the spacial reasoning, the tests are the same as the pdf they give you to look at, just more questions and a little harder maybe (especially with time constraints). But nothing should really take you by surprise.
As for stage 2, I failed last week, but some of us get through right? So thats not really worth worrying about, just go with it as you get to it.