delete student work
I want my student to start Spanish 1 Duolingo on a clean slate. A few of them have done some on Spanish before coming to class, and I want them to clear all their previous work. How can I do that?
Teachers are unable to delete student language progress; however, a student can through their course settings. The following article explains how to do so: https://support.duolingo.com/hc/en-us/articles/204611904
I usually don't worry about if they have started already. You can always assign the topic and assign a certain amount of xp that is due at the same time. That way in order to get the xp they will need to repeat the topic. Also if you look at their history, it will let you know when they completed it.