We are just starting a new middle-school volleyball program at a very small school. Consequently, we have parent Coaches that don't know much about the rules. Would someone please respond to the following questions: What, if any, differences are there in the rules between the middle-school, JV, and Varsity level? (i.e.: net height, ball size, rotation, etc.) Does the "let serve" rule apply to any/all middle-school games? Have they switched to rally scoring this year?