The government school next door

There is a boys government high school in the lot next door to my house. I can see it from my window. It's a boys' high school, right? So tell me this: Why are there little boys in attendance? And why are there girls there?
So this was exam week.
The children lined up in these rows on the ground to take their tests.
The passersby, especially army personnel, like to watch them over the wall.
The teachers also sit on the ground for their breaks and meetings--except the head teacher.
But even she has to stand up in attention and give over her chair when the big man comes to inspect things.
Everyone is very relieved when exams are over.