Kinda like polling: within the margin of error.
Yes it is. I was going to comment on the low precision of these rankings; but I opted for brevity. If the parents, teachers, and students believe that they’re improving — that can motivate them to strive for more. The usual reaction to these rankings is denial (or accusations of class-ism and racism, etc.) Celebrating a small victory is a big step forward (even if the “victory” is only an illusion — a statistical blip).