To answer the question, we must first understand the function of the mitochondria. The mitochondria is a double-membraned organelle of a eukaryotic cell. It is the site of cellular respiration. Cellular respiration is the process in which glucose and oxygen are converted into carbon dioxide, water, and energy (in the form of a molecule called adenine triphosphate, or ATP).
Thus, we could explain that the mitochondria are like schools because schools produce a lot of energy.
If the question is asking to relate the mitochondria to a part of a school, then I would relate the organelle to the cafeteria. A mitochondrion is like a cafeteria because that is where glucose (food) is consumed and energy production after consumption occurs.
I hope that helps! Best of luck!