Firstly, if you don't pass the selection then you need to seriously look at where you went wrong. The selection for these schools is not difficult(yes, I would know, I've been to both). Give yourself adequate preparation time and you should be absolutely fine. No secrets really...failing to prepare is preparing to fail. Research the selection process, prepare for it well, know how to pass an interview(again, not difficult) and you WILL pass. All that said, don't make the mistake of thinking that these extremely expensive schools are the only option and will somehow make you a better pilot than anywhere else because they're better at getting your money. Look into ALL available options. CTC/OAA are definitely the easiest way to the RHS of an A320, but it costs an arm and a leg(120k+) and make no mistake; there are no guarantees. You'll also have to give up your job and the training drags on much longer than it should. We all have our own preferences and views on things, but personally I think there's a lot to be said for going modular and spending 40k or so and if you're smart about it you won't have to give up your current job.