I've recently sat stage 1 and if it's the same tests I passed then you don't need any in depth knowledge of the different planes, I read the information 3 or 4 times before the exam and felt quite confident after the test.
As you've probably saw from other posts there are harder parts to it than the motivation paper, but I think staying relaxed throughout the tests is the best advice I could give you.
Good luck with stage 1
