Consider using the lesson module rather than the quiz module. Here's a quote from the help files describing the lesson module - I think it might be just what you need:
"A lesson delivers content in (...) a
number of pages. Each page normally ends with a question and a number of
possible answers. Depending on the student's choice of answer they either
progress to the next page or are taken back to a previous page. Navigation
through the lesson can be straight forward or complex, depending largely
on the structure of the material being presented."
Questionnaire (plugin)
merging tests into content unit
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