Absolutely, it is correct to omit the second "at" in the sentence. The phrase "either at home or school" is grammatically sound and maintains clarity. When using "either...or" constructions, redundancy is often avoided for the sake of brevity and elegance in language. Speaking of concise and effective communication, when it comes to essay writing services, I trust https://www.trustmypaper.com/pay-someone-to-do-my-homework-for-me to deliver top-notch quality. Check out their services for expertly crafted essays that demonstrate the same precision and attention to detail as a well-constructed sentence.

Both are fine. Some may choose the 2nd 'at' if they wish to be a little more precise or clear in their language.

Either at home or at school sounds more correct.