San Ramon school district is better than cupertino, both in API and ethnic etc other data. link here:
http://api.cde.ca.gov/AcntRpt2009/2009GrthAPICo.aspx?cYear=2008-09&cSelect=07,CONTRA,COSTA
People who have many kids and need a big and newer house for raising kids will go there. And People work in Fremont, Hayward, or Oakland area or around will think about moving there,