As a guideline I went for a selection course with FTE last year, 8 of us attended, 2 of us were given offers there and then, 4 were asked to come back and re-sit parts of the assessment and 2 were told not to re-apply.
Not sure how this compares to other FTE selections or the process at OAA/CTC etc. I'm guessing the answer would be they have to set a standard, but aren't going to be quick to turn down such a large amount of money.