I am a high school junior in Lima, Peru. The school year here ends in December so I will graduate December 2021. I am a U.S. citizen, my family moved to Peru in 2018 to start a business. Any suggestions on how to deal with the difference in graduation months on my application?
I don't see where the issue is. You apply to try to attend in the autumn of 2022 and you start your application in the summer and autumn on 2021... where I'm using Northern hemisphere seasons.
Are you a citizen with a permanent residence (mailing/voting address) in the US? Those, and interviews are probably your biggest hurdle. I'm sure interviews could be done by internet. Determining your Congressional District would be based on your permanent address.
Is there something specific you're concerned about?