I'm going to Tulsa Community College. There aren't any prerequisites that I know about. Usually there is a waiting list but I was able to get around it because I didn't have to take ATC Basics since I have exp. This particular school requires a private pilots license. Not all schools require this. Just check around and sign up for one soon. Keep in mind it can be expensive if you get a bachelors degree. The one I'm going to is an associates but it gives the same CTI certificate. And remember to try for the associates from a community college because it will be faster and you won't get a useless bachelors degree in ATC because the CTI is not a sure fire way to get in.