Someone I know whi is a ROSPA instructor said not to do them as it is not possible for one person to take in that amount of information in such a short amount of time and the pass rate is low
It was a good many years ago but I did one. I wanted to get it done and dusted. I'm glad I did. It worked out cheaper too. It was a local company and not residential. I couldn't have been away with 2 small children.
Apart from sharing the front of a Micra with an enormous body building driving instructor on the hottest week of the year it was fine.