&gt; Test scores are shooting up, but it&#x27;s not like they fired all the teachers and hired new staff at twice the salary.<p>Why are you assuming that the schools are responsible for the higher test scores?  In my immigrant, upper-middle class community, there&#x27;s nearly universal use of after-school test prep and tutoring from companies like Kumon.  I&#x27;d argue that&#x27;s the reason you&#x27;re seeing test scores &quot;shoot up&quot; once only few low-income families are left in a neighborhood.