As an admin, you can create grading schemes for all accounts associated with your account.
Once a grading scheme is created for your account, instructors can link the grading scheme to their courses. However, once a grading scheme has been used to assess a student, you cannot edit the grading scheme.
Note: Any grading schemes you create in an account will also display within sub-accounts.
Click the Admin link , then click the name of the account .
In Account Navigation, click the Grading link.
Open Grading Schemes
If Multiple Grading Periods is enabled for your institution, click the Grading Schemes tab.
Add Grading Scheme
Click the Add Grading Scheme button.
Edit Grading Scheme
Create a title in the Scheme Name field . For each line item, edit the grading scheme name in the name field . Edit the minimum end of each individual range in the To [Number] % field .
If you need to add ranges, click the Add icon  to the left of any range checkbox. You can remove individual ranges by clicking the Remove icon . When you are finished editing your grading scheme, click the Save button .
Click the Save button.
Modify Grading Scheme
Your new grading scheme will appear underneath any previously used grading schemes. If you are able to edit the grading scheme, you can edit the scheme by clicking the Edit icon . To delete a grading scheme, click the Delete icon .
You can only edit grading schemes that have not been linked to a course. However, grading schemes can always be deleted.
If you delete an account-level grading scheme that has been enabled at the course level and used to assess a student, the grading scheme will not be deleted from the course.