Here's an interesting Quiz hook: Redirect Unauthorized Users from Quiz Page

For more control over access, you can use the mpcs_redirect_quiz_to_sales hook. It creates a redirection of unauthorized users from specific quiz pages back to the course page. Implement this by customizing the redirect logic in the accompanying function. This is the basic code structure:

function mpcs_redirect_quiz_to_sales_fn($redirect, $quiz) {
    // Custom logic here
    return $redirect;
}
add_filter('mpcs_redirect_quiz_to_sales', 'mpcs_redirect_quiz_to_sales_fn', 10, 2);