Captain Weird,
Few suggestions
1 - read this entire thread - there's alot of waffle going on, but also alot of good info regarding all aspects of the selection process
2 - what level of flight experience do you have? your knowledge should commensurate your level of experience at the very very least, but would be strongly recommended you study material beyond what you would be expected to know with your experience. There is a base knowledge level that is expected of you being the material in the JKI booklet that is sent to you when you are invited for stage 1.
3 - you can never be too prepared
goodluck and sit patiently till u get the email invite