The school wasn't located on Earth, but on a heavily guarded space satellite. It was a school for privileged students. Their successful parents sent them there to get their education. The pupils at the school were the heirs of millionaires.
The prefects were security androids who looked like human students and carried weapons. Their purpose was to protect the lives of the population at the school.
In the 28th century the Eleventh Doctor, Amy Pond and Rory Williams visited the school. DI Canyon was headmaster of the school. Perkins and Willious were prefects. Milton Hope Valentine was a student at the academy. (AUDIO: Darkstar Academy)