It has a complicated calculation method, which most of our students can't calculate, because the GPA score is directly given by the educational administration system.
But you can look at the number of credits in that subject. The greater the credit, the more points you get. For example, calculus, the school stipulates that its course credit grade point average is 3, and the grade point average score is above 90, all of which are above 4,85 or 3.5, above 80 or 3, and so on. If you get 85 points in the exam, you can divide it by 3.5*3, and then weigh your other grades, which is your GPA this semester.