It's a new school year and I'd like to delete my previous year's classes, students, and activities. How can I do this or should I just add more classes to my existing grade book?
What a good question for the start of a new year. You can save your classes to a flash drive (USB stick) to have them as a reference to the activities you did throughout each marking period or term last year. They could also be printed out. Another option would be what you suggested, delete the classes with the students and activities and then start clean. I would highly recommend that you follow this link below and watch a video created by one of my colleagues that explains the whole deletion process.
Whatever you choose, we wish you a happy and productive school year!