What is true about school desegregation under Brown by 1960?

c

a--i seriously doubt if 50% of schools had been desegregated.

b--nope. definitely not in those areas

"In 1957, Arkansas Governor Orval Faubus called out his state's National Guard to block black students' entry to Little Rock Central High School. President Dwight Eisenhower responded by deploying elements of the 101st Airborne Division from Fort Campbell, Kentucky, to Arkansas and by federalizing Arkansas's National Guard.[31]

Also in 1957, Florida's response was mixed. Its legislature passed an Interposition Resolution denouncing the decision and declaring it null and void. But Florida Governor LeRoy Collins, though joining in the protest against the court decision, refused to sign it arguing that the attempt to overturn the ruling must be done by legal methods.

In 1963, Alabama Gov. George Wallace personally blocked the door to Foster Auditorium at the University of Alabama to prevent the enrollment of two black students. This became the infamous Stand in the Schoolhouse Door[32] where Wallace personally backed his "segregation now, segregation tomorrow, segregation forever" policy that he had stated in his 1963 inaugural address.[33] He moved aside only when confronted by General Henry Graham of the Alabama National Guard, who was ordered by President John F. Kennedy to intervene."

d--i could find no information regarding a repeal.

i see why you posted. i looked for almost an hour and found squat.