You can do the diagnostic test in multiple sittings: I think I split it up into 3 parts? To some extent, though, I don't think you're meant to spend lots of ti

You can do the diagnostic test in multiple sittings: I think I split it up into 3 parts? To some extent, though, I don't think you're meant to spend lots of time on each question struggling to figure it out as it's trying to determine what bits of the course you can skip, so if you can't answer a question relatively easily it's best to just say "Don't know" and move on so you get some revision during the course.