99 – 100 = A+                            83 – 85 = C+

96 –   98 = A                             75 – 82 = C

94 –   95 = A-                           72 – 74 = C-

91 –   93 = B+                             68 – 71 = D+

88 –   90 = B                              64 – 67 = D

86 –   87 = B-                            61 – 63 = D-