Controlling student use/continuation
When I give an assignment, once they've completed the assigned level, I want students to be forced to STOP using duolingo (temporarily) until I've assigned the next level.
Is this possible?
No, and I can't see Duolingo implementing a feature like this. It goes against their ethos.
No, it isn't. If your students want to do more studying, why would you want to stop them?