Quiz participants can be Confluence users and groups or external participants without an account in Confluence. There are two options for quiz participants to get enrolled to a quiz:

Share a Quiz

To share a quiz, you need to click the ‘Share quiz’ button on the quiz page and enter participants you want to assign a quiz to. Once you share a quiz, participants will get an email with a quiz link.

Refer to Documentation for details. 

Click 'Expand' below to take a look at an included sample quiz page and see the 'Share quiz' button. There you can try sharing a quiz with yourself if you enter your email address in the 'Share quiz' window.

 

The original page of this sample can be found here.