You learn where not to go, and what not to see
The difference is, at the inner city school, the kids have next to nothing. It's gladiator school.
The kids at Francis Parker on the other hand, have every advantage. If you sit in the coffee shop across Clark Street facing the window at 7:30am, you will see the line of Bentleys, Aston Martins, etc, dropping off little Trevor for school. And those are the less wealthy families. You can tell the really wealthy families because the children are dropped off by a non-white driver, sitting alone in the front seat (and yes, I have seen little Driving Miss Daisy caps on the drivers). They don't give little Mitt a lunchbox, they give him a platinum visa so he can pop down the street at lunchtime and eat on proper tablecloths and terrorize the wait staff. The parents treat the faculty of Francis Parker a little worse than they treat the undocumented aliens they hire to do their lawn care and nannying.
Anyone who believes there are no social classes in the United States just needs to spend an hour at Francis Parker to learn the truth.