They start school at seven twenty-five,” says David Levin of the students at the Bronx KIPP Academy. "They all do a course called thinking skills until seven fifty-five. They do ninety minutes of English, ninety minutes of math every day, except in fifth grade, where they do two hours of math a day. A n hour of science, an hour of social science, an hour of music at least twice a week, and then you have an hour and fifteen minutes of orchestra on top of that. Everyone does orchestra. The day goes from seven twenty-five until five p.m. After