To Change a students grade level and add new ones you need to go to:

1. Core > Users Access > Profile
2. Look up the Student 
3. Go into Student Enrollment under system information
4. Here you can edit the grade for every year only if they do not have a contract associated with it. If they do have a contract associated with that year you will have to delete it before you can edit that year.
5. You can also add another year by selecting enroll in school and filling out those dropdowns