I have an assessment for OAA next week, have never been to any previous assessment days for flight training or done anything like this before so not really sure what to expect in terms of the exam situations.
For one thing you can practice these things.
Look it up online or spend some money on books.
Anything which is done by the school itself carries at least a hint of conflict of interest.
Years ago I knew somebody personally who was completely socially retarded ( yes, I said the word) and he passed an assesment with a large school.
Keep in mind that being able to complete the training does not mean you will be succesful in this industry.
Being able to finish medical school doesn't make you a good doctor either.
*** By the way there are significantly cheaper options for your training, don't hang up your hat at the first big-name ***