Is mackerel middle school a real school?

There is no widely known or documented school officially called "Mackerel Middle School." It's possible this is:

* A fictional school: Used in a book, movie, game, or other work of fiction.

* A very small, local school: With limited online presence.

* A misspelling: Perhaps you're thinking of a school with a similar name.

If you can provide more context (like where you heard about it), it might be possible to find out more.