Correct me if I am wrong here but I believe that California schools used to be the top in the nation and now they are near the bottom.  Way below Texas.  You can track the decline in California Public Schools directly with the power of the teacher's unions.  When I was in public elementary school in California in the 70s we took tests every year (they were known as the Stanford Aptitude Tests) and were told were we placed in comparison to all the students in the state.  In addition, teachers success in teaching students was available for all to see.    
If you went to public school in California in the 70s you took these tests.  If you have children in California public schools you know that these tests are not given out anymore.  You can thank the teacher's unions (and the Democrats for that).