Hi Melissa,
If you have the SCM math handbook, the forms are broken down into approximate U.S. grade and age. The forms are how schools describe the different stages of formal education – like what we think of as elementary, middle school, junior high and highschool. They are not always cut and dry though for translating into US grades as, during Charlotte’s time, many children stopped going to school at a much younger age than they do now, some went on to a trade school, prerequisites changed for university entrance, etc.
HTH
Richele