I have no doubt about that. I was a fan for many years. If you were to take a real look I think you could make the case that if they wanted a certain person to win they would have categories related to that persons education or background. Contestant number one, with your degree in music, in the category Bach to the Future, identify this piece of classical music.
While it is always possible there could be some rigging, having been a contestant I can tell you that it would not be easy. They are very strict about not doing something that would favor any particular contestant. It would kill the show if it was found to be cheating in some way.