The full name of GPA is Grade Point Average, that is, average grade point average. The GPA of American general courses is 4.0, that is, A=4, B=3, C=2, D= 1. There are also some advanced courses, such as honor courses and AP courses. The GPA score of a single subject can reach 5 points or even 6 points. The accuracy of GPA often reaches 1 to 2 digits after the decimal point, such as 3.0 and 3.45.