The age ranges are general guidelines. If you have an older student who needs work on building a strong writing foundation, we will recommend the lower level classes. Students must have achieved mastery to work above any class level. Mastery means that he or she can apply the elements taught in the earlier classes on his or her own (no help) in all of his or her writing – not just “in theory” or on worksheets. Many students have learned these elements, but cannot apply them consistently in writing, which means they have not really achieved mastery.