In some ways its a shame that Oxford and FTE don't split the days, so at least you could infer where it went wrong.
Ie if you fail at CTC day one, its because you didn't pass the tests or the other components of day 1. Or if you pass day one but don't get to final selection it is because you didn't do a good enough job on the interview..
Out of all the non mentored schemes, CTC wings does seem to have the strongest employment record and most vigorous selection..
I'm also guessing that the majority of BA pilots didnt join as cadets, which is by far the most competitive route.. So there are other ways to join BA once you get your licenses and experience.
Reflect where you can do better for next year and you will be stronger as a result.