Rating System
3.5-5/15 Wouldn't Recommend
1.5 star
D
5.5-7/15 Just Fair
2 star
D+
7.5-9.5/15 Worth Trying
2.5 star
C/C+
10-11/15 Recommend
3 star
B-/B
11.5-13/15 Highly Recommend
3.5/4 star
B+/A-
13.5-15/15 Must Read
4.5/5 star
A/A+