yeah...no such thing.
But attitude during test plays a part too i guess. Right minded
attitude and with the right impressions will make the tester more
willing to pass you.
I am sure he will be less forgiving if you potray youself as some
fierce gangster out look or the likes. In fact, if poss, try to
potray yourself as a fillial son that have to help out your parents
with their job delivery...hee hee..more likely to pass IMHO.