CLEP exams are performed at more than 2,000 testing centers across the nation. Many of these take place on college campuses, some are independent facilities. You can visit the College Board website to search for testing centers near you. Regardless of what school you attend, you can take your exams at almost any testing center.
You can only take CLEP exams in-person, using the computers at the testing center. You cannot take CLEP exams online.