Reddit reviews Why Boys Fail: Saving Our Sons from an Educational System That's Leaving Them Behind

You're talking about male representation in college, but the problems with education for boys starts much earlier.

There are many issues boys face in school. Studies have shown that boys do better with male teachers, but elementary school teachers are nearly all female. A recent study demonstrated that female teachers tend to discriminate against boys when grading. Teaching methods have been tailored to girls' strengths, often to the disadvantage of boys. Certain skills have been pushed earlier in the curriculum, which disadvantages boys due to their slower biological maturation. Boys without their biological fathers at home do worse in school, and more and more boys are growing up without their father. Boys face a culture of "girl power" in school, where they feel neglected. Some blame video games. Others blame an anti-intellectual cultural ideal for men. A lack of recess and physical activity in school is also thought to hurt boys.

The list of issues is long, and some of them are heavily debated. There have been many books on the subject - a bit of google time will find you some. Why Boys Fail is one I read a while ago.