Pre/Post Test LMS Question

I have a course that requires a Pre and Post test. If you score a passing grade on the Pre-Test you do not need to take the course. If you don't you need to finish the course and take the post-test. I know Storyline can only report one Result slide to the LMS.

I have a scene set-up for each test, which uses randomized questions from questions bank. At the end of each I have a results slide, for which I have disabled the next and previous buttons. For the Pre-test I have it set-up that if they fail the continue button takes them back to the course. If they fail the Post-Test they can retry the quiz.

If they pass either test the continue button takes them to a new scene with currently a blank page and this is where I am stumped on what I do next. Should I set-up a simple quiz question along the lines of "Please check yes if you have completed and passed the quiz." and create a results slide of that? If so, how do I tell the LMS which result slide to take the answer from?