Unfortunately, I haven't kept up on my data for about 15 years, but back then two of the most strongly correlated factors of a student's performance were 1) how

Unfortunately, I haven't kept up on my data for about 15 years, but back then two of the most strongly correlated factors of a student's performance were 1) how many books were in their home, and 2) how many college educated adults lived nearby. The amount spent per student had a tiny positive correlation. That said, I'm sure there's a minimum baseline of spending per student that needs to be achieved. With all the raise to the top and gates foundation money floating around since then, I'm sure there is better data now. But, those factors really stuck with me.