In school,my child was pushed by a child and felt, and hurt. We went to ER, did the surgery. We want the school pay the medical expense and recovery

You need to speak with a lawyer who specializes in personal injury work.  Although you don't say, I assume that this is a public school.  The laws which govern when and how a school is responsible for an injury to a child vary widely from state to state.  I might be able to recommend a lawyer if I knew where in MO you lived, but all I can tell from the post is that you're in Missouri.  If all else fails, try searching the SuperLawyers website for a lawyer near you whose practice area is personal injury-plaintiffs. Good luck.