The selection process is not hard. You have to remember, unlike the forces selection process, and those of airlines choosing already qualified pilots, CTC's ultimate aim is to make money. They are a business, one which will get their money regardless of placement with an airline, regardless of your success or failure.
I've been there, passed and turned the opportunity down after looking deeper into it all.
You may get lucky, you may well pass and get a job through them, but right now there is a huge queue which you will be at the back of.