It could have something to do with the predominance of women teaching kindergarten through eighth grade. My kids didn't have a male teacher until they got into eighth grade and only one. Most reading assignments tended to be biased towards the girls, little to interest the boys. Schools are reducing physical activity time (recess), so boys tend to be a lot more restless and disruptive in class.
I have both girls and boys, and these are observations from just two schools; but I believe the observations to be descriptive of the problem with boys. I haven't looked at the stats for college entrance in 2012, but last time I looked the percentage of young men entering college as Freshmen nationally was only around 35%. Boys are definitely being under served in schools.