Delete a Column from the Grade Center
On the Grade Center Action Bar located at the top of the page, point to Manage to access the drop-down list.
Select Column Organization.
On the Column Organization page, select the column(s) you want to delete out.
Click the Delete button.
Click Continue and then Delete.
Click Submit.
Reorder Columns in Grade Center
On the Grade Center Action Bar located at the top of the page, point to Manage to access the drop-down list.
Select Column Organization.
On the Column Organization page, Drag the 
symbol for the column, release to where you want the column to locate .
Click Submit