I also worked in a special school for minority sixth graders called prep for prep. They came from public schools all over New York City. This was a school which met all day saturday during their sixth grade year, and all one summer.
The students were then placed in prestigious private schools in the city and given special guidance and counseling from then on through college.
It was a privilege for me to teach science (and a little string figures) to these gifted young men and women.