I'm going to second durangod2 and state that this plugin is a great concept but needs alot more refinement before it can be expected to work out-of-the-box as intended with many WP plugins.
You will need to code and hack out this theme for it to display properly as leaving it default, there is stuff all over the page that a 5 yr could make a better displaying web page (apologise if i am being to blunt).
When i check out the user results, they are all anonymous even if i am logged into the site and doing the test. It would be great if it just used the custom name field (that is filled in prior to taking the quiz) to use as the name in the results page.
Also, is there any options to export and collate the results? If you get 300+ people a week doing the quiz, how are you going to collect the results so you can properly analyse them?
Like I said, great concept - but still aways to go