Overall ratings:

Score rangeGradeLevel
0-74
D
Low
75 - 149
DD
Low
150 - 224
DDD
Low
225 - 299
C
Low
300 - 449
CC
Low
450 - 599
CCC
Low
600 - 749
B
Medium
750 - 899
BB
Medium
900 - 1199
BBB
High
1200 - 1799
A
High
1800 - 2699
AA
Excellent
2700 - 3000
AAA
Excellent