> A 'C' grade is supposed to be 'average'. Says who? I find mastery-based grading much more logical. Take the Finnish or Estonian school system, it's very rar

> A 'C' grade is supposed to be 'average'. Says who? I find mastery-based grading much more logical. Take the Finnish or Estonian school system, it's very rarely curved like in the States. If you master the material you get a good grade. PISA results seem to indicate that works well.