Agreed, there are a few things on Wiki that you need to check, but it is a good start...
As for the Stage 4, make sure you get a good nights sleep (easier said than done....) the night before, listen to the instructor, and do your best!
I am at odds as to whether a flight sim helps or not, i thought it was nothing like Microsoft Flight Simulator (it was a million times better!)
At the end of the day, they are not looking to fail you (the same can be said for all stages) they are looking for a natural ability to fly/follow instructions and learn!
relax and enjoy!