1. Maybe.
I had some good teachers who cared while others who did not give a shit. I had one teacher in high school who used to let us shoot craps and drink beer in the back of the class while he read the newspaper -- and I attended one of NYC's best high schools.
2. I dunno.
Many HBCUs have horrendous graduation rates. I went to a big private majority white university. However it had a largebenough contingent of Black students that you could in your own social Bkack bubble.
Besides people with the wherewithal to attend a major white university, self esteem is usually not our problem -- it is our strength. A white university is a cakewalk compared to an inner city ghetto.