I keep occasionally getting students who complete a course except for one lesson, and then emailing me to ask where their certificate is. I always explain they need to get to 100% course completion, and they need to go back and find the lesson they didn't complete, but it would be helpful for me to have an additional tool to mark a lesson complete or incomplete on behalf of a student. Related: https://simplero.canny.io/feature-requests/p/more-control-of-the-certificate-process , https://simplero.canny.io/feature-requests/p/possibility-to-mark-lessons-as-not-complete