wow, the linked related article about NYC school segregation was depressing: https://www.vox.com/2016/2/16/10980856/new-york-city-schools... especially the part about charters having two times during the year when low-performing students are forced out into the public school: one in October after per-student funding is allocated to the school, allowing them to grab the funding while pushing a now-unfunded student onto the public school, and again in Spring right before standardized testing, when they can weed out the ones who did poorly on prep tests. Seems like the city/state should step in and disallow this practice.