reset test radio buttons within session

I'd like to reset the radio buttons on my questions to blank so that if the user fails the test, he or she can go back and retake it without seeing their original answers and without exiting the session. I can't seem to find any global variables that refer to the test selections. Any ideas?I'd like to reset the radio buttons on my questions to blank so that if the user fails the test, he or she can go back and retake it without seeing their original answers and without exiting the session. I can't seem to find any global variables that refer to the test selections. Any ideas?

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