Summer vacation is evil
"The country claims to take schooling seriously, but the school calendar says otherwise. ThereÃ¢ÂÂs no other public service that we would allow to just vanish for months at a time. To have no Army in February, no buses or subways in March, airports closed down for all of October, or the police vacationing en masse in December would be absurd. Schools, it turns out, matter a lot, too, and having them shut down all summer critically undermines them."
Here is a link that might be useful: Summer school vacation is evil