Discoverers are allowed to retake Career Key Discovery once. They can do so from their Profile page, where they see their saved careers and education programs.
Before they can retake the assessment, they will see a warning pop up.
Although discoverers will not be able to see their first set of assessment results, you as the counselor can see both in CK Central when you click on their name to see Discoverer Detail. Click on the top tabs to navigate between them.