Change the way results are shown when using the Quiz module
Generally speaking when you need to alter the output of a module, you need to override the theme function which is responsible for formatting the data you'd like to alter.

You can do this either by overriding the theme function within template.php within your theme (can get messy quite quickly with a lot of overrides), or by overriding the theme function within a custom module (I would rather recommend doing it this way).

There's plenty of reading material on the subject out there to get you started. Just remember never to hack away at the core or contrib module's theme functions!! :)

Good luck!