I'm sorry to say that the conclusion I have drawn from stage 1 of this process is that it is a massive money making scheme.
Welcome to the real world of aviation - all the FTOs are money making schemes, some more massive than others. I personally would rather the BA selection stage had not been run in partnership with the FTOs but there is no way in this day and age that BA are going to fund their own screening and/or run their own in house training courses for ab-initios, and frankly as an ab-initio your hand is going to be in your pocket at some point.
As others have said, there are other ways into BA. You need to take the long view and also accept some are even tougher/more selective ways into flying/the airlines/BA than the FPP/cadets, some paths are perhaps less selective but more expensive.
Reflect where you can do better for next year and you will be stronger as a result.
Sound advice.
Good Luck.