My feeling is that school performance is denominated by the students and parents.
If for example, you took the best performing school district and the worst performing school district and swapped just the parents and students keeping the school staff, administration, and facilities the same, the previously best school district would end up near the bottom and the previously worst school district would end up near the top.
If for example, you took the best performing school district and the worst performing school district and swapped just the parents and students keeping the school staff, administration, and facilities the same, the previously best school district would end up near the bottom and the previously worst school district would end up near the top.