Results - show incorrect questions without showing correct answer

 Another option would be to set up a test review. When the user fails you could have them loop back through the test and use an action or actions to display a marker next to the response they chose. I would hide the selection options and lay a new next button on the pages to just let the user page through to the end, that way there is no way they could retake the test. It would take a while to program but it would work.

AndrewMiller said:We have created a test - is it possible to show users what questions they got incorrect without showing them what the correct answer is?