Override Basic Action for Quiz
By default, when a user opens the Quiz record, the standard page will be displayed. To launch the Quiz Visualforce page instead of having a standard Salesforce page, override the behavior of the View button:
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Go to Setup → Object Manager → Quiz → Buttons, Links, and Actions.
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Click Edit next to the View label.
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In the Override Properties section, select Visualforce page and QuizInformation[QuizInfo] next to Salesforce Classic Override.

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Click Save.
The setup is complete. Now, when you click one of the buttons above, the Quiz Visualforce page will be open.
