i ordered for my son AG who will be in 6th grade next yr. Once i finish the 10 wek intensive study once week to review seems too little. should i supplemnt with growing with grammar or something else.were used intensity Of R&S. Also during the 10 wk intenive how long does it take to do daily grammar. do you all do it 5x a week. in review stage how long do the reviews take. need plan ahead for scheduling. thanks mariss