zuluflyer
Being an ex student, I can assure you that I do not believe OAA are biased with the skills assessment. The RBI part of the test is probably the most complicated (it was for me anyway) - perhaps the guys with PPL's have seen this instrument so have been able to get familiar with it. Out of the other 16 guys on my course, 2 had a PPL, and all got on the course without having to retake any of the skills assessment.