BTW - for UNC you will want to follow their plans regarding CS. It has been a major that students can just declare vs one that requires secondary admission (have to apply to the major once you are at UNC). However, due to popularity UNC has been considering changing that and in fact announced they would make CS secondary admission this week. There was a lot of uproar and they backtracked that decision for now, but just make sure of situation when it is time for you to apply.