My friend graduated in December instead of all the way in June. I was wondering if it was possible to take online classes while your still going to school and graduate early

It is possible. Most of the time it takes some time and meeting with school administration to discuss how you plan on making this happen. It's a big decision however and you should put a lot of thought into it before making it. You'll need time to prepare. You're going to need to have time outside of school to get in extra classes and the pressure might be a lot. Usually online classes need some kind of proctor so a school official will probably need to help you set that up. As long as you have the time and are not all the way into the school year you should be able to work something out. Also credits can be an issue I would consider looking over your schedule and making sure you have all the credits you need. I doubt you want to be taking very many classes outside of school on top of the ones you are already taking in school. Good luck