Analysis:

Math scores in the final exam of senior one: A 90 to 100, B 80 to 90, C 70 to 80.

It is fairer to express achievements;

Compared with the score system, the hierarchical presentation can overcome the negative impact of one-sided pursuit of scores, and the use of grades to express grades can make admission more fair.

In educational examination, scores and grades are both orderly symbols, grades are rough scores and grades are subdivided grades. Research shows that the use of grade scores is more conducive to reducing the error of the exam itself, which is more in line with the actual level of candidates.

At least it can be considered that the fractional error is not necessarily less than the grade error. Because it is hard for us to believe that 99 points must be better than 98 points; The difference of one point does not really explain the difference of students' actual ability and quality.