I don't understand why 'je suis en classe' is correct but 'Sarah est en classe' is incorrect
"Je suis en classe" means that (generally speaking) I am in a lesson somewhere in school/college. It would be the same in the expression "Sarah est en classe".
"Je suis dans la classe" means (specifically) that I am in a specific classroom rather than in an indefined classroom in a school/college. It would be the same for "Sarah est dans la classe".
I hope this is helpful.
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