Each of your class teams has a Grades tab where you can view all your assignments and grades at a glance.
Viewing the Grades tab
To open your Grades tab, navigate to the General channel in a class team and select Grades.
Here, you'll see all your assignments listed with the nearest due date at the top. View your status on each assignment as well as points you've received on graded work. Assignments without points will show as Returned after your teacher has reviewed them.
Use the arrows next to Due date and Assignments to sort your assignments.