Sorry you had trouble figuring out how to get access. But it does say at the top of the QuestionRepositories section:
I have to admit that the question repositories don't work well. There is certainly a lot of interest in sharing questions but experience suggests that, with a few notable exceptions, most people are more interested in sharing other people's questions than their own.
If someone wishes to set up a server to manage the sharing of CodeRunner questions in a more effective manner, I shall be delighted.
I have given you access to the SQL and Python question repositories.
Richard