My CAA PPL(A) was completed in 75 Hours including about 20 Hours PIC (lots of Solo circuits whilst waiting for decent cross country weather).
Then it took me a few more hours than most people to grasp the VFR Navigation side of flying. Well the theory was fine it was just putting it into practice!!!
Average exam results lets see (from memory so may be a little out)...
Aircraft Technical: 72%
Meteorology: 85%
Air Law: 85%
Navigation: 95%
Radiotelephony: 95%
Human Factors: 95%
Umm so that gives me an average of 87%
Pass mark for PPL exams eight years ago in the CAA days was 70%.