Try to use the module Game for Moodle. There a game named "Book with questions"
In each page of the book connects one category of questions.
To go to the next question have to answer correct one random question from corresponding category.
A demo can be found at http://play2learn.gr/moodle/course/view.php?id=18.
Book
questions in book
This discussion has been locked so you can no longer reply to it.