The average blck adult reads at a 3rd or 4th grade level, even after 10-13 years of free education.
Only 50% of blck kids graduate high school. Principals report that most of them drop out because the school work is too difficult.
And of the ones that actually do graduate, it is often as mentioned earlier, with a reading level of 3rd or 4th grade.
Blck academic talent is generally so low that kids are simply passed on to the next grade every year, or "socially promoted" to the next grade. Because nobody wants the optics of a 3rd grade class full of 17 year olds still trying to learn how to read and write complete sentences for the 13th year in a row.
Same goes for math.
https://edsource.org/2017/at-cal-state-algebra-is-a-civil-rights-issue/582950
The culprit is Intermediate Algebra, a high-school level course of technical procedures that most college students will never use, either in college or in life. Many students pass a course on this content in high school (Algebra II), but when they arrive at a community college, more than 80 percent are required to take remedial courses repeating this material if they don’t score high enough on a standardized test. And the problem is, most community college students don’t take just one remedial course. To meet the Intermediate Algebra standard, they are often required to take two years of remedial courses that don’t count for transfer credit at CSU. By contrast, a CSU student who is required to take remedial math at CSU does not have to demonstrate intermediate algebra competency in order to take credit-bearing math courses.
As a result, every year, more than 170,000 California community college students are placed into remedial math based on how well they do on a standardized test in algebra. Over 110,000 of them never complete math requirements for getting an associate degree or for transferring to CSU or the University of California.
https://www.hoover.org/research/seattle-schools-propose-teach-math-education-racist-will-california-be-far-behindseattle
https://www.brookings.edu/blog/up-front/2020/12/01/sat-math-scores-mirror-and-maintain-racial-inequity/
And science
Physics exemplifies the problem. African-Americans make up about 14 percent of the college-age population in the U.S., commensurate with their numbers in the overall population, but in physics they receive 3 to 4 percent of undergraduate degrees and less than 3 percent of Ph.D.s, and as of 2012 they composed only 2 percent of faculty. No doubt there are many reasons for this underrepresentation, but one troubling factor is the refusal of some scientists to acknowledge that a problem could even exist. Science, they argue, is inherently rational and self-correcting.
https://www.scientificamerican.com/article/racism-and-sexism-in-science-havent-disappeared/