Online Testing Addon allows you to paste any quizzes through the shortcode to any page.
You can enable the Online Testing addon in the STM LMS > LMS Settings > Addons section of the WordPress dashboard menu.
By clicking on the Gear icon or following STM LMS Settings > Online Testing from the dashboard, you will find a shortcode that you need to use in order to paste a quiz to any page.
Go to the Quizzes page and add a new Quiz (see this article to learn how to create and add quizzes)
On the Quiz editing page from your right, you can see the Online Testing with the ready-to-use shortcode in there. Just copy the shortcode and paste it to the page.
On this particular page, there will be a quiz you created that you can start and finish.