This can be used when you want to see the attendance for a particular course (e.g. English Set 1).
Go to School > Programmes > Courses. Click + next to the course name to bring down the modules. Keep clicking the plus button until you are at the bottom level course.
Click Attendance on the left-hand menu of the course page.
This page will show each mark they have for that lesson on that day. It will only show dates for when there was a lesson scheduled for that class.
You can download multiple classes into Excel and calculate the average percentage in each class and across the Year Group/ School on a Course basis using this information.