A+ = Over 100%        A   = 100-93%        A- = 92-90%

B+ = 89-88%               B  = 87-83%           B- = 82-80%

C+ = 79-78%              C  = 77-73%           C- = 72-70%

      D+ = 69-68%              D   = 67-63%           D- = 62-60%