Which school does Eustace and Jill attend in The Silver Chair?

Eustace and Jill attend Experiment House in The Silver Chair.

Experiment House is an unpleasant boarding school in England where the two children are classmates. Jill has been bullied there, while Eustace—newly changed by his earlier adventures in Narnia—tries to encourage her. They flee from the bullies and pass into Aslan’s Country, beginning the book’s central quest.

The school matters because it contrasts sharply with Narnia. Lewis presents it as a place ruled by fashionable educational theories and poor discipline, while Jill and Eustace discover courage, loyalty, and responsibility through their mission to find Prince Rilian. Aslan sends them to Narnia with four signs to remember, and the marsh-wiggle Puddleglum later joins them.

A common mix-up is confusing Experiment House with a real historical school or with a Narnian location. It is fictional and appears primarily in the opening and closing portions of The Silver Chair. The novel was published in 1953 and was the first Narnia book centered on Eustace without the Pevensie children as its main protagonists.