I don't think CA has any HBCUs at all and of the CA schools with a larger black enrollment, none are well known or considered high achievement. But when I say "education" I'm referring mostly to primary and secondary (K-12). That is the age group that is most indicative of the priorities in the house.
The disparity in educational attainment shows up in statistically significant ways as early as kindergarten. So even before the education system is employed, there are large disparities in academics. This difference comes from what is done in the home to start children's development. Black homes are much less likely to practice numbers, letters, ABC's , etc.
These are not hard tasks. They don't take a Phd in the house to accomplish. They are time oriented tasks. If you don't take the time to practice ABC's with your 4 year old, your 4 year is going to start out behind.
The issue, however, is not where a 4 year starts, that disparity can be erased in a year or two. The bigger issue is the culture in the home that is unlikely to ever change. So, a parent that is unable or unwilling to practice ABC's or read to their child is not more likely to get engaged as the child progresses in school and subjects get more challenging. They are even less likely. and bad habits learned in early childhood are hard to modify later. This has a cumulative effect on the achievement level of that child. Black families are not the only families guilty of this, but they do so at much higher rates than other demographics and it is substantiated in almost every academic measure we have ever taken the time to compile.