I mean, it isn't enough to merely have 100% kids of proactive parents. Sure, that's an edge, as everyone who doesn't give a golly goshdarn winds up at your friendly neighborhood public school (if your neighborhood is backward enough to still have one).
After all, when you live and die by scores, you'd better make sure you have good ones:
Three former employees of the Albany Preparatory Charter School claimed an administrator at the school was trying to improve the school's scores on state standardized tests by denying admission or wait-listing learning-disabled students, an investigation has found. Some parents of students who did not perform well on a reading test were counseled that the school was "not a good fit" or would have their applications denied, according to a scathing new report by the State University of New York's Charter Schools Institute.