Calculation method: Convert the scores of each subject into score points, and then weight the obtained figures according to the proportion of each science.
GPA= (course 1 grade x course 1 credit+course 2 grade x course 2 credit+course 3 grade x course 3 credit+...) ÷ total credit.
For example:
Suppose you always take three courses.
Chinese 4 credits 88 points, math 4 credits 80 points, English 2 credits 90 points. Then your GPA is 88*4+80*4+90*2)/(4+4+2)=85.2.