Isn't Zurich far richer per-capita than NYC? I would think there is more than just what happens in a school that dictates the testing outcomes.
> 75.3 percent were economically disadvantaged [0]
75.3% = "if their family participates in specific economic assistance programs or meets distinct low-income thresholds."
[0] https://www.schools.nyc.gov/about-us/reports/nycps-data-at-a...