Because the external pressure is different. The IQ advantage in mathematics is very obvious, and there is no difference between men and women at the top of the pyramid. Mathematics is equally difficult for most ordinary people. But when encountering difficulties, a considerable number of boys will die. Because he will face the problems of "the man pays the down payment", "the man's income is 2000 higher than mine" and "if you don't study hard, you have to farm" in the final exam. Faced with the same problem, women's scores are "it is better to study well than to marry well" and "just support themselves". Different pressures lead to different results. The "superiority" mentioned here is not an advantage in ability, but an "advantage" in external force. It's like the college entrance examination. Many people say that students in Shandong, Hubei and Henan have higher scores. It's not that the students here have bigger brains and are smarter, but that the pressure of further study here is greater. Ability is forced out.