At the University of Maine’s cooperative extention offices in Skowhegan, sweetness is on many minds. The annual Maple Grading School, sponsored by the International Maple Syrup Institute, based in Ontario, will be taking place on Thursday and Friday.This school provides instruction on syrup quality assurance and grading for producers, inspectors, and buyers. Participants are coming from all over New Jersey and New England. Now in it’s sixth year, the school rotates to different sites each year. This is the first time the school is being held in the state of Maine.Vermont is the leading syrup-producing state by far. Maine and New York were the number 2 and number 3 states this year.