However, if the college entrance examination is the sum of scores of many exams, then if an exam is particularly difficult, the discrimination of this exam will become higher. From the mathematical point of view, it can be calculated that the weight of this course in the total score has increased. This is obviously unfair.
So to put it simply, the difficulty of the college entrance examination paper will affect the weight of each course. But each student is good at different subjects, which leads to unfairness.
If two people are about the same level. However, mathematics is more difficult, this course has caused a gap of 20 points, while other courses have simple papers, which only caused a gap of 2 points. Then it must be unfair for a student who is poor in math and good in other courses.
In fact, I think it is a trend that the college entrance examination questions are getting harder and harder, but why is it getting harder and harder? One generation is indeed more advanced than the other, paying attention to education (just look at the parents' attention to education now) and improving the level of education (the level of exam-oriented education now is definitely much higher than before, because of the foundation of predecessors), so the increase in the difficulty of the test questions now is actually a kind of "relative difficulty unchanged". Because the education level has improved, I can learn more knowledge in three years, so I will move some calculus to high school. But for the proportion, the basic difficulty has not changed, I think.
So I think it doesn't matter whether the absolute difficulty is high or low, but the difficulty of all subjects in the college entrance examination needs to be kept at the same level. In other words, the final score, standard deviation or variance of each course are very close, reflecting the offset or discrimination of this exam. -I don't think reducing or increasing the difficulty of all subjects at the same time will affect fairness. However, if a single course increases the difficulty, it will obviously have a major impact on fairness.