The Edge V3 has a feature called Autoskip. If a lesson is attempted 4 times and does not reach a minimum score of 75%, the lesson will be marked "Skipped" and the student will be able to continue to the next lesson. They can always go back to play skipped lessons 2 days after the initial skip.
Note: The student must start and finish the lesson 4 times. If they exit the lesson prior to finishing, that does not count as an attempt.

If the student is frustrated and cannot continue their current lesson, the teacher can skip the lesson from the teacher's account.
Go to the Edge - Overview page and click on the Info button on the right for your student. On the pull down menu, select "Upcoming Lessons".

On this page, click on the "Skip" button under actions. You may also click "Disable" for future lessons.
