Guys and Girls.
There is only one piece of advice for Stage 1.
Study! And when ya think youve done enough, Study MORE!
All ATPL notes, HTBJ, All prune info, CX Capt ABC Book, Any tech resources you have, and dont forget youre current types.
I hit the books for almost 6 months on and off for stage 1, there were still a few areas i could have known more. But i got a second interview on the way, so all is not lost!
Oh and one other thing. DO NOT FORGET to prepare for the HR questions too. Its the whole package of preparation that will get you through what for most of us is a process we dont get much practice at.
Good Luck to all.