What do we do if two tutors create the quiz at approximately the same time? How do we prevent two tutors from adding questions to the same quiz? Could we use title instead?
What if we allow the user to create their own quiz ids, based on the options available? that way the user will have to refrain from using existing quiz ids. We could throw an error if the quiz id is already in use.
If two tutors create the same quiz id at once, we need a fallback to see who writes it first. This should probably be handled in the back-end.