What is difference between “Standard” and “Studio” worksheet?

We have a wonderful list of worksheets for the “Standard” level for our legacy teachers to choose from. The “Studio” level provides all kinds of resources that every teacher needs. Some are designed for state level theory exams, others are worksheets that were requested by teachers.  We also have worksheets that are designed as supplements for a specific method book. Currently we have worksheets for a few books in the Piano Pronto® series.