Is there a test (paper or in app) that I can give to my students?
I'm teaching ESL, but my students nearly all come from the same language background (either Korean or Chinese. Always grouped by class so not mixed). I would like to do a quiz with them on their Duo homework, which has been assigned throughout the semester, but am not sure what to test on.
If there isn't one built into Duo, is there any way for me to fully unlock the English from Korean tree so that I may go through the lessons and see what specific grammar points they had to be able to make a quiz?
You can't assign a test using the assignments system, sadly. I've requested that feature, though - if you scroll down through the educators forum, you'll see my post, and you can upvote it if you'd value that feature.
You can unlock the further lessons of the tree by doing what Duolingo calls testing out of the skills: either do the placement test when you first add the course, or use the checkpoints, the yellow bars at various points in the course, or test out of individual skills by clicking on them and choosing the test out option.