Few other (large) threads that could help you out if you haven't seen them yet
http://www.pprune.org/dg-p-general-a...ight=rex+cadet
http://www.pprune.org/dg-p-general-a...ight=rex+cadet
http://www.pprune.org/dg-p-general-a...ight=rex+cadet
http://www.pprune.org/dg-p-general-a...ight=rex+cadet
I don't know the first thing about Rex, but theres also an article in the latest Australian Aviation which could give you an idea of their culture towards training/cadetships.