This happened to me, and was one reason why my parents pulled me out of school and I taught myself at home with a standardized curriculum.
It was only 1 kid in the class, but he was ruining the entire class almost every day, and the administration didn't want to risk the political fallout.
It was great to be able to learn as fast as I wanted with no distractions. Sometimes what has to be learned wasn't interesting and I didn't go any faster at it, but I did pull ahead in math by a couple years by 8th grade.
It was only 1 kid in the class, but he was ruining the entire class almost every day, and the administration didn't want to risk the political fallout.
It was great to be able to learn as fast as I wanted with no distractions. Sometimes what has to be learned wasn't interesting and I didn't go any faster at it, but I did pull ahead in math by a couple years by 8th grade.