"This report should be a wake-up call for the world," said Save the Children International CEO Inger Ashing.
Around 535 million children—a quarter of the world's child population—live in fragile states, affected by natural disasters, epidemics and other emergencies.
"The teachers taught better than those at Zhuanshanbao Primary School. Pupils don't talk in class and everyone is focused on studying," a disappointed Wang Fuman said.
"[Delivering packages is] not hard, I am willing!" Chang Jiang said enthusiastically in a video.