在WES看到他们的grade conversion guide是这样的：
China
Grading Scale
Scale 1 Scale 2 Grade Description U.S. Grade Equiv.
85-100 5 Excellent A
75-84 4 Good B
60-74 3 Average/Fair C
0-59 2 Fail
F
Grading scale may vary. Please refer to grading scale on transcript.
不知用过WES的同学，他们是统一这么
