I'm no fan of public education, but this is always one of the most deceptive statistics that is used in assessing school performance.
My parochial high school actually had a lower average SAT school than the public high school in the same town, but what the statistics didn't reveal was that 98% of my graduating class took the SAT while less than 50% of the public school students did.
But it is just about the only one we got. Pa. ranks low in other categories too so there is a correlation.
However -- in Pensylvania, money will NOT solve the problem, but it will WORSEN it. Discretion and Accountability are the cure -- liberal supplies of money poisons those cures.