cheating on assignments
I don't know how to deal with students cheating. I cannot choose a random topic for my students, because whatever they do, they have to to it in the set order. If I tell my students to get 100XP in a week, they change the language and instead of learning Spanish they learn Italian and still score XP. Another problem is that if I choose a topic for a homework, some students may have done it already, and do nothing, while others have to do ALL the previous topics to get to this one.
Since you're asking about the Schools system, you're more likely to get a useful response if you move this to the Educators forum.
Don't delete it and create a new one, just click edit, and change the topic from Duolingo to Educators. Here's a guide on how to move a post: https://www.duolingo.com/comment/16609773.
My answer would be that XP assignments aren't much use, because of precisely the problem you've mentioned. How about setting a particular skill, to make sure all students have got that far, and then at a later point in time getting them to show you that their tree is still gold?
the thing is some of my stundents are really talented and eager to do duolingo. While others not so much. So when I ask them to do a particular skill some have already done it, and others are far from getting there (this will discourage the weaker students from pursuing their goal, because they'll find it too much work at once, and it will also discourage the better students as they've already done it long time ago and will feel that they are awarded without any effort.
If you want your students to progress at different paces, then you could put them in different classrooms, and set the different groups different assignments.
You could still do with moving your post to the Educators forum, where other people who use the Duolingo for Schools system will see it, including the relevant Duolingo staff. Don't delete it and create a new one, just click edit, and change the topic from Duolingo to Educators. Here's a guide on how to move a post: https://www.duolingo.com/comment/16609773.
In that case, you're not subscribed to the Educators forum. Click on Discussion at the top of the page. On the right hand side of the Discussions page, there's a panel with your list of subscriptions. Click edit at the top of that panel, and subscribe to the Educators forum.