1. You were scored by the teacher. Take the school that gave the answer as an example. 85-89 all give 3.7 GPA. If you get 89, you will only get a GPA of 3.7. If many teachers put your grades in the highest score of the same grade point (89 points of 85-89), which is commonly known as the grade point, then there is a big gap between the actual grades and grade points.

2. The caliber of your so-called "grade" and "grade point" algorithm is inconsistent. What algorithm is the score based on? Is it a weighted average of credits or a simple average? Do general education and physical education count as "grades" (usually grade points)? Generally speaking, courses with higher credits are more difficult to get high scores, so the simple average score is generally higher than the credit-weighted average score. The so-called "grade" of a subject, if simply weighted, is naturally different from the grade point.

I hope the above contents can be helpful to the subject. Of the two possibilities, the second one is bigger, so it is suggested that the subject know about the GPA algorithm of our school.