A = 100

A/A- = 97

A- = 94

A-/B+ = 92

B+ = 89

B/B+ = 87

B = 84

B/B- = 82

B- = 79

B-/C+ = 77

C+ = 74

C/C+ = 72

C = 69

C/C- = 67

C- = 64

D = 59