Ender's Shadow (The Shadow Series, 1) [Card, Orson Scott]

Welcome to Battleschool. Growing up is never easy. But try living on the mean streets as a child begging for food and fighting like a dog with ruthless gangs of starving kids who wouldn't hesitate to pound your skull into pulp for a scrap of apple. If Bean has learned anything on the streets, it's how to survive. And not with fists