Do you think that race is a factor in education in the US?
Do I think that racially biased teachers is a big issue? No, I'm pretty sure the vast majority of teachers want what's best for their students, regardless of the students' backgrounds.
Do I think different mean IQs between different groups is a factor in US education? No, not one bit. The differences between groups are only very slight. Exam results and academic potential are the criteria for college/uni applicants, not IQ scores.
Race and culture must never be conflated because they are two different things. Race (or ethnicity) is something a person cannot change but culture is behaviour and thus can be changed.
Having said that, there is some overlap with race and culture, e.g. Latino people often have 'Latino culture', black people often have 'black culture'.
African-Americans have a big problem within their culture that is surely a factor in education ... and that's the high percentage of single parent families.
I read somewhere that more black kids in the US grow up without a father today than in the 60s or at the time of emancipation.