Students in your classes will be able to view the assignments you create for them on their homepage when they log into their Khan Academy account.
Here's a preview of a student's Learner Home page.
Students can also view their Past assignments.
Mobile app assignments (students only)
At this time, teacher tools are not available on mobile apps; however, the apps do allow students to complete assignments.
For students to get the assignments in the Khan Academy app, they'll have to access the My Classes section. Then, tap the class where the content was assigned.
Note: Make sure your students have downloaded the most recent version of the Khan Academy app to ensure that assignments show up properly.
For more details on the My Classes section, check out this article [hyperlink].