Each Subject of a class must have relevant assessment categories such as Assignment, Homework, Quiz, Class Participation, Project etc. Ad-Din Solution has very robust calculation built in to it, use this excel spreadsheet that represent how the calculations are done automatically to meet the Ministry standards. Grade/%Marks are Automatically calculated based on the activities created and marked by teacher against these assessment categories. Final Grade Letter and or % Mark automatically lands on Ontario Education Board provincial report cards. % in below image is just an idea.