Reason: The classic works are so impressive that they are generally interpreted by mature actors, so they will give themselves less points.
Don't choose the classic monologue.
For the same reason.
Don't choose prose.
Reason: Prose generally has no narrative and story, so it is difficult to impress the judges.
Personal suggestion: Choose short fables and mini-novels, preferably with suspense and baggage. Make people interested in listening and attracted.
You can borrow the Fables of krylov from the library or choose mini-novels.
Don't worry, the school drama club won't ask for too high a threshold. Come on!