--------------------|---------------------
A+ | 4.0
A | 4.0
A- | 3.67
B+ | 3.33
B | 3.0
B- | 2.67
C+ | 2.33
C | 2.0
C- | 1.67
D+ | 1.33
D | 1.0
D- | 0.67
F | 0.0