There are actually many reasons for this. First, from the structure of male and female animals or the personality characteristics of male and female students,
For girls, going to college is to stabilize their lives, which means that they can find an iron rice bowl or a stable job in the future. Then many girls will choose normal schools or economic schools to study. This will lead to a particularly large number of female students in these professional colleges. Many girls are not good at science, but their thinking is not agile enough. So many girls don't choose to study science, but specialize in liberal arts.
In this case, because of the boundary between science and liberal arts, the proportion of male and female students in the original high school has been unbalanced. There are also many universities that are liberal arts or science, so there are more boys in science universities and more girls in liberal arts universities.
This has caused a serious imbalance between men and women in these universities.
Moreover, boys and girls have different employment views. Girls seek stability, but boys don't. Boys are adventurous and impulsive. So they like to go to those emerging majors or majors about science and engineering. In this case, most boys will concentrate or gather in a few majors, resulting in a particularly large number of boys in these majors, thus forming a serious imbalance between men and women.
Boys want high income and like to start a business. In this case, they say that the schools they want to go to will be more inclined to these categories, while girls are just the opposite. So in such schools, there will be many more boys than girls, and in normal schools, there will be many more girls than boys.
Therefore, the reason why there is a serious imbalance between men and women in colleges and universities is actually closely related to the concept of career choice of boys and girls.