Sometimes students will sign up for the incorrect class and then will need to have their grades moved to the correct class. You can move a student's grades by importing/exporting their grades, or by manually overriding their grades.
Export Grades from the old course for the student: https://support.cambridgepub.com/support/solutions/articles/240909-export-grades
Import Grades from the exported document: https://support.cambridgepub.com/support/solutions/articles/240908-import-grades
Manually Override Grades: https://support.cambridgepub.com/support/solutions/articles/241876-override-grades