So... is Gakkou no Kaidan finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Gakkou no Kaidan follows siblings Satsuki and Keiichirou as they move to their mother's hometown after her death. They start attending the local school, an old building rumored to be haunted.
Soon, they discover that the rumors are true and the school is teeming with vengeful spirits. These ghosts were once banished but have now returned.
The story centers on Satsuki, Keiichirou, and their friends as they try to survive these terrifying encounters with the supernatural. They'll need to work together, and even rely on their pet cat, to face the dangers lurking within the school's haunted halls.