To add a grade, type the grade identification, name and register classes in the text boxes
and click on the Add button. To remove a grade, click on the grade in the list and then
click on the Remove button. To alter the identification or name or classes of a grade,
click on the grade in the list then overtype and click on the Add button.
Subsequently you will be adding specific information about grades, including the subjects
to be taught and by whom. If you remove a grade or register class here, that data will also
be removed.