One mistake of the ending of school segregation was that one day they were segregated and the next day they were not. It was like suddenly putting 3rd graders in a 6th grade class. Most blacks were lost as their schools were inferior. Attempts to arrange classes by student capability was blocked as attempts at re-segregation. Results was to fail the black students, holding them back which was not allowed, or to teach all 6th grades at a 3rd grade level. It was a long lasting problem that served neither student.