Cupertino, home of Apple (AAPL), has the top score while its median home price is less than two million dollars.
School District - API Score - Median Single Family Home Price
Cupertino Union - 962 - $1,530,000
Los Altos - 961 - $2,450,000
Saratoga Union - 959 - $2,280,000
Palo Alto Unified - 932 $2,535,000
Los Gatos Union - 929 - $1,772,500
Mountain View / Whisman - 863 - $1,420,000
Sunnyvale - 831 - $964,500
This table has the above plus changes in median price over the last year and since the 2007.
From California Department of Education: Home » Testing & Accountability » Accountability » Academic Performance Index (API)