You cannot be serious
IMHO the OATS APP is one of the most cynical marketing cons that the flight school industry has spat out for as long as I’ve been aware of it (since I was about 16). They charge £72,000 for the same course that BAe charge £54,000 for.
All this rubbish about selection is rubbish – if it was meaningful selection, you would get through sponsorship selection, and be on the eJ/JMC/Brit/CTC McAlpine/Buzz/etc cadet schemes, and not be paying over the odds for a bog standard course. If you fail those selections, then go to OATS; harsh, but true. The exception to that is that you are out of the age limits for cadet schemes. I’m lucky; I’m not. If I was, I’d use my limited funds carefully, then apply to the CTC ATP scheme.
After the selection comes the training. OATS have a great reputation for groundschool; probably well deserved. But a pass is a pass. Who the hell gives a stuff about the ATPLs once you have them? The flight training is bog standard – up to CPL given in the States at a FAA school that OATS bought, and the IR bit back at Oxford. As far as I can see the £20K is justified by promising to tell you how to write a CV.
My assessment is that OATS are no worse than other schools – but I cannot detect anything about them that is better, and therefore they go on the reject pile as they are trying to con me out of money I cannot afford.