Best school in Philadelphia area?

I'l probably be moving to the Philadelphia area soon and my wife and I have a 3 year old son. Education is very important so what is the best school(private or public) in the area? I want my son to be an excellent tennis player so I started him when he was about 2 and a half(I will let him stop playing if he wants, I wont force him to play) so the school will hopefully have a good tennis team, but thats not mandatory. What is the best academic school in the area?