You were forced to go to public school by your father, Lance corporal Levi. Of course no one, except the principal knew your real identity. Even if you were an Survey Corps member you never went on expiditons and you were only allowed to fight if the wall broke down, that is why you were in an public school, studying. Still you were a good soldier. Your father, Levi, didn't participate in your school much, wich pissed you off. But one day that changes, and your school gets to know about everything.