What are boarding schools like?

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What are boarding schools like in Germany compared to America or anywhere else in the world? Please could you give detailed answers. Thank you 😊!

Do you have to share bedrooms and bathrooms?

Are they just for wealthy

rich kids, famous celebrities children and royal kids?

What type of extra curricular clubs are there?

Is it easy to make friends?

Do I need to learn a language if I am in a German boarding school?

Any suggestions or the names of good boarding schools would be appreciated.