If a teacher teaches a course that has ended, they can't easily get to the grade book from the previous semester or trimester b/c the Grade Book option o the My Day page disappears at the end of the trimester or semester. It would be great if this link stayed active until the Grades for that previous trimester or semester are due. While I'm still writing report cards, I have to go back to the calendar or find the group and get to it from there. 

Some teachers only teach part time, so they can't get to another Grade Book and then navigate from there easily either.