THE Ken Ade Private School is not much to look at. Its classrooms are corrugated tin shacks scattered through the stinking streets of Makoko, Lagos’s best-known slum, two grades to a room. The windows are glassless; the light sockets without bulbs. The ceiling fans are still. But by mid-morning deafening chants rise above the mess, as teachers lead gingham-clad pupils in educational games and dance.