Cached result of grades array methods as per David's comments
Cached result of grades array methods as per David's comments

MarkUsProject/Markus,benjaminvialle/Markus,benjaminvialle/Markus,MarkUsProject/Markus,MarkUsProject/Markus,benjaminvialle/Markus,benjaminvialle/Markus,MarkUsProject/Markus,benjaminvialle/Markus,MarkUsProject/Markus,benjaminvialle/Markus,MarkUsProject/Markus,MarkUsProject/Markus,benjaminvialle/Markus,MarkUsProject/Markus