The translation depends on the context. Can you elaborate more about where you are trying to use this sentence? Like, are you answering someone's question on social network, or are you writing an essay about what you are currently doing?

我在学校

我在學校

The question you asked is very good. I read it carefully but could not find anyone to help me understand it. Anyone can describe it correctly here https://apkbik.com/

我在学校里