(Al Jazeera) – Fifth-grader Amr Khalil, 12, sits on the floor with about 30 other students. He stares at his teachers, his mind too busy to think about the pain in his back from sitting on the uncomfortable floor. Khalil is one of the thousands of students in the city of Taiz who now study inside private homes after their schools were damaged by fighting, transformed into shelters for families displaced by the war raging in Yemen, or used by Popular Resistance militias fighting against the Houthi rebel group.