The greatest tool for efficiently grading in a course with a lot of student production is using a Unit or Chapter checklist. I require students submit the assignments with the checklist on top. This allows the students to have a list of what's due as well as trim the amount of grades a teacher has to enter. Instead of having to enter 5 separate grades, I am entering one for the section/unit/chapter grade. This tool has really helped students and myself keep organized in classes that have a lot of volume. Checkboxes for students to verify and a line for them to initial guaranteeing their work is original.