As a talent selection examination, the postgraduate examination is gradient and discriminatory, which is the reason for the large score gap. Mathematics needs strong logical analysis ability, clear thinking and rigorous thinking, which is related to a person's brain, but it is not the IQ you said, because everyone has his own strengths, some people are good at logical thinking, and some people are good at thinking in images.

I think your worry is that your IQ is not high enough, you can't learn math well, and you can't get high marks in the exam. I can tell you that you may not be a quick-thinking person, but the postgraduate entrance examination is more about one's perseverance and diligence. As long as you find a way, study hard and make unremitting efforts, there is no problem in getting good grades in the exam. Come on!