100~95 A+ 4.3
94~90 A 4
89~85 A- 3.7
84~82 B+ 3.3
81~78 B 3
77~75 B- 2.7
74~72 C+ 2.3
71~68 C 2
67~65 C- 1.7
64 D+ 1.5
63~61 D 1.3
60 D- 1
<60 F 0