About 37 percent of the region's students met or exceeded math standards on the state's new Common Core-based standardized tests, but test results often varied tremendously by school.
Some schools saw just 2 percent of tested students meet math standards. Other saw more than 75 percent hit the mark.
A clear trend emerges: Students living in wealthier areas tended to do better than students living in areas with much poverty.
This map shows, in green, the 50 local schools with the highest percentage of students meeting math standards. It also shows, in red, the 50 schools with the lowest percentage of students meeting math standards.
Source: California Department of Education
Note: Only includes schools with at least 150 students taking test.
Want to see more? Is your school not in the top or bottom 50? Go to this state web site to search all schools. (Warning: The state's site was getting slammed and running slow at 1 PM Wednesday.)