Among college administrators it’s known as The Boy Problem. But it’s a problem that starts in grade schools, high schools and homes. Boys lag behind girls in being prepared to apply for college. While American colleges were roughly balanced between male and female students a generation ago, now most schools have more women than men. Some have a lot more. Nationally, 57 percent of undergraduates are women. And as the applicant pool continues to trend toward women, more schools are reaching the tipping point of having more than 60 percent women.