I would say #1, but all 3 are correct. "I'm a pupil in kindergarten" is correct but is formal and antiquated.

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Thanks for the answers! When you are a native speaker, it can be difficult to remember all the rules. First, when I read your question and answer options, it confused me. But really, grammatically, all answers are correct. By the way, grammar is not my strong point. Sometimes, I used the services of top writers from https://edubirdie.com/top-writers to do some homework. They often helped me. I wish you success in learning the language.

First two expressions, you can formally use🙂