Hi Tim,
I've been thinking on this one but I haven't been able to come up with a way to manage it without building two quizzes. Totara/Moodle quiz doesn't have a way to differentiate groups of questions that the scores would come from.
I wonder if SCORM might be a better option since you can build more complex quizzing and it at least keeps the user in one activity?
Thanks,
Lori