Limit to only one test

Hi.
There’s a way to limit the users to complete only 1 test? So the users can visualize their results and if they want to attempt a new test, this will update the old test.

This way I can add a result link in their profiles. The user visualize their own result and avoid possible overuse of the plugin.

I also want to send the test link in emails. I will buy the paid “Email results”, but there’s no way to generate only one test result link for each user.