I am not sure what you're asking, but it sounds like you've received the assignment of creating an analogy comparing the parts of a cell to a school. This is a pretty common assignment in life science.
An analogy is just a comparison, so look at what each part of the cell does. For example, the mitochondria is the powerhouse of the cell. What part of your school provides power? Make that the mitochondria in your analogy.
Look at the parts of a school -- classrooms, closets, the principal, buses, the walls, etc.
The key here is that you show your teacher that you know what the parts of the cell do. Look those up and make sure you know them. If you compare the Golgi apparatus to the school janitor, make sure in your analogy you show how those two are alike.