OK maybe not finshed yet as such a good debate.
Have you seen the books on aptitude testing? There are a few.
If so many pass the aptitude tests then why do they fail? Surely if the aptitude testing is that good then students would not fail.
To go back to my original thread, the so called training is not to guarantee any pass at all. But to give prospective candidates a far greater knowledge of ATC than the suggested reading. Therefore this knowledge should give the candidate an advantage over someone else who has only read the minimum required.
I would personally employ a person who has gone further, (using whichever method), to obtain the knowledge required to get a job. It shows determination to succeed.
Many years ago a company called "Aviation Foundation Training" was formed, working out of the old Bournemouth Airports Directors House. This was run by a CAA assistant. The company had a better success rate than the college. The only reason was that people were paying for it and there was more attention payed to the students.