In the UK, the practical part of the driver training test is judged by the trainee scoring fault points each time they make a mistake. At the end of the test, these fault points are totaled, and have to be less than 40 for a pass.
My question is, does anyone have any idea which of the many possible driving faults occur most frequently and account for the most test failures?
Or putting it another way, is there any particular driving skill that is particularly difficult for trainees to master in the relatively short time they get to practice during a training course....

I have tried asking the UK accrediting bodies, but they don't assess this information, which seems strange to me since they are the ones who design the training courses and define the fault points scored for each type of error. In these days of KPIs and continual improvement I would have thought knowing what areas cause most failures would be critical information.

Any insights into US training would also be helpful.