Racial prejudice and bullying, a lack of funding, inadequate mental health support, and inexperienced teachers — those are just some of the challenges Black students face in America’s K-12 public schools. We see some of these issues show up on television on “Abbott Elementary,” but representations of Black students and schools are a mixed bag on the big screen. Some films — we’re looking at you, “Dangerous Minds” — dive right into the stereotype of the white savior teacher who rescues bad Black kids from their terrible neighborhoods and families.