Letter RatingCorresponding Points RangeA-90 to 93.99A-90 to 93.99A-90 to 93.99B-80 to 83.99B-80 to 83.99B-80 to 83.99C-70 to 73.99C-70 to 73.99C-70 to 73.99D-60 to 63.99D-60 to 63.99D-60 to 63.99F0 to 59.99