You only have the option to export if you are set as a Lead Tutor in the managers' area.
1. Click on Submissions on the top toolbar.
2. Tick either individual student's workbooks or tick to select all of them.
3. Click on the Export button.
4. Choose Grades only.
5. Click on Export.
6. Wait until your CSV file has downloaded.
7. Press the X in the top-left to close the pop-up box.
8. You can then open the CSV file in Excel.