As Barbara stated, it is very subjective. The like she provided is very useful and where I direct all my clients to research school information. Realtors are also prohibited from discussing School and Neighborhood information which further complicates things though for a good reason.
One thing I like to tell my clients (and I cover the Peekskill area) is that Report Cards are measures of past successes and failures. They do not predict the future. I have seen kids get lost in so called great schools and I has seen kids achieve the unimaginable in public schools. One does not have to look far as Peekskills own Elton Brand showed us all what is possible.Mel Gibson, born and raised in Peekskill until his family moved when he was 12.
I honestly think that what ever route you choose, being a part of your child's education will actually play a bigger role in their own success than what school you send them too. Use the schools as a tool to HELP you educate your child and your child will reap the rewards.