Corresponding grades generally do not refer to students' absolute scores, but relative scores. For example, a student's test score is 50, because the test questions are more difficult.

If 30% of the students in this area are below 50 points, the grade is C qualified; In the same way, there are very few students below 50 points, so his grades have to be classified as D- unqualified.

Extended data:

The corresponding relationship between grades and corresponding test scores is generally divided into: A- 100-85- excellent, B-85-65- medium, C-65-60- qualified, and below D-60-unqualified; Under special circumstances, grades and test scores will be re-divided according to specific circumstances, such as physics class for one semester.

Due to the difficulty of the test questions, there are few students with a score above 85, but there are many students with a score below 60. At this time, the overall grade will be lower, for example, the number of unqualified people will be controlled within 10%. The grading scores are adjusted as follows: A-75, B-75-55, C-55-45, D-45 and below.