I think why he’s feeling nervous about school is because he’s scared of what others will think of him because of his face and surgeries, his other feeling is scared because he might be scared of getting bullied for how he looks like. Auggie’s laugh/cry feeling was when Julian said what’s the point of your face is where u like in a fire or something, his feelings got hurt and he felt like crying but he wanted to laugh at the same time, but why? Maybe it hurt him but he didn’t want to cry because he found it embarrassing to cry in front of them so he had this feeling he should just let it slide and not care about what others think.