I passed (19), as I also did recently when my colleagues said it wasn't possible to know all that and tested me on it one lunch time. I'm a useful person in pub quizzes.
However, while I think people should be aware the Bronze Age was a few thousand years ago, I don't think it matters if you think it was 4000 or 5000. I think questions like that shouldn't be "give an exact date for this thing we only have vague dates for anyway", but to match certain events with particular centuries or reigns, or to take some eras (e.g. Bronze Age, Victorian, Regency, Edwardian, Tudor, Vikings) and put them in date order.
I think the questions about things like the DVLA and court system and electoral processes are more important.