Resetting a quiz

I have a single assessment in my course that is being used as the course pre-test and final assessment, since my LMS can only track one assessment for completion. So what I'm trying to do is have a student who fails the assessment be directed to take the course, but when they reach the assessment for the second time, they are unable to take it a second time. Any ideas on how I can reset the quiz values on failure?

Thanks!

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