Phil and I always discuss, as we are parents to six boys, how school seems to be geared towards girls. We are not the only ones to think this. Seriously. We look around the top kids in our high school, the top kids in the elementary school my kids attend, and it's overwhelmingly females. Girls seem to be "built" better for schools. More able to sit still and concentrate, more motivated by attention from good behavior, more likely to excel at language and reading, which makes them more likely to succeed overall.
I remember clear as day when Maggie was not even three years old, we went to a bridal shower, and she sat at the table and colored for the majority of the party:
The other little girls there did the same. I remarked to my sister that I had never seen one of my kids sit and color for so long. She, being the mother of two little girls, couldn't believe my astonishment. My boys would color for maybe two minutes before they were running off destroying something to figure out how to put it back together. Having a girl seemed so much easier! I can imagine that teachers who are trying to get kids to focus in a classroom would find girls easier too.