Alister Doyle, I work at Noodle.
It depends on what you think the "best" school is and I guess one way to measure would be to look at how schools perform in state-wide tests. Here is a link to the 2013 results from the MCAS exams released by the state Department of Education: 2013 MCAS Results.
You can search by specific districts for a summary of its overall performance, and you can also get a school-by-school breakdown. For example, here are the results for Bourne Public Schools, with both the district summary and a school-by-school breakdown.