Isn't it funny that most who have posted on here are very close to the minimum requirements? Which is not a true reflection of the general averages.
So, to buck the trend; 67 hours for PPL(H).
It is not a particularly good indicator of how good a pilot you are or will be. In fact, there is much anecdotal evidence to suggest that the longer one took, the better pilot they may be in the long term. There are many other factors including the attitude of your instructor or school, whether part time (over how long?) or full time etc.
As for exam marks - you pass. That is all that is required. I could tell you my average but, as a girl, I don't have a willy to wave.
Cheers
Whirlygig