In order to assign or unassign a course to a classroom:
Navigate to the "Assignments" tab in the Admin Dashboard
For each classroom, Assign or Unassign the course by clicking the green or Grey boxes accordingly
Where possible, set the progress limit for the relevant challenge number by pressing the small downward arrow and click "set progress limit"
*You can also assign or unassign all courses to all classrooms
*You and your teachers can still assign or unassign a course from the classroom dashboard courses tab