As @izrk02 said, it depends on the school. My daughter’s school (Rice) gave credit for 4s and 5s but allows students to take the class again with no indication of it being a “repeat”. My daughter is a mechanical engineering major and chose to take Physics (Mechanics) again even though she received a 5 on the equivalent AP test. She felt it would give her a stronger foundation in a subject that is critical to her degree. (Personally I wouldn’t have retaken it but that was her decision.)