One example of an Afrikan-centered private school with an accelerated curriculum.
http://marcusgarveyschool.org/
The main benefit of similar programs is they are proven in their ability to close the academic achievement gap that most public systems only play lip service to but fail miserably due to high class sizes and student-teacher ratios.
Home schooling and independent study programs also have the benefit of not only turning around students in danger of failing but providing an opportunity for students to catch up and get ahead.
I am director of an independent study program which had proven track record of taking pre school students and have them reading on first grade level within ten months.
I presently have a second grader who was in our summer enrichment program last year who tested last week in the 80th percentile on a 3rd grade test. Another in the 73rd percentile. These are first graders going to the second who I have instructed their teachers to place in a 4th grade math group. I also have two third graders who scored in 84th percentile on the 4th grade test.
Some of these students do attend a public school, but it is a science magnet with accelerated curriculum. I am talking about five girls, all Ethiopian-American, who have a strong extended family network/community.
I can attest to the benefit, and value of home schooling. When I put my kids into public schooling, my oldest tested at least 2 grades higher in many subjects. My son has a hidden intelligence. If you press him, he will clam up. But if you leave him alone, he will astound you with his ability to reason. He has a problem with comprehension, but I recently found out that it's with things that are fairly simple. The more complicated it is, the better he gets it.
Peace!