I would encourage you to use the longer IDs for the unique student IDs. You can create easier GradeCam IDs which can be used over and over. If you choose to have the student ID autofill on the form, GradeCam will use the unique student ID. If you choose to have the student fill in the student ID bubbles on the form, they can use the easier GradeCam ID that you can create for them.
Please let me know if you have any trouble setting this up or other questions.