BRIDGEPORT, Conn. - Satya Mohan never saw students dance in the hallways before, let alone bang on lockers and doors as they often do outside his third-floor classroom at Bassick High School. Eight-and-a-half months into the school year, this teacher from India has grown used to it. "Excuse me, off to your room," he tells a student who doesn't belong in his fifth-period science class, before motioning him out and shutting the door. The dozen students who do belong in the class then set about the task of finishing an assignment on polymers and recycling. Darren Thompson, 15, a freshman...