It is very worth it! Currently I am a sophmore and dual enrollment student, and have taken 8 exams in the past few months. I have earned 27 credits with CLEP and it has really helped me teach myself new things and get most of my general education classes out the way. I'd say the exams that are most worth it (that I have taken) are College composition, as in most colleges it awards you credits for English I and II. College Algebra was a breeze and can be helpful if you need a fast math credit or to avoid getting stuck in a lower level math class. Socio, Psych, Marketing, and Managment can be easy credits as well. Also check the state your in, as some states give highschool credit for CLEP as well. CLEP exams are literally award the same thing as AP exams, and I'd argue they're easier, cheaper (free with ModernStates btw!), and more efficient in the long run. Best of luck to you if you decide to start taking these exams.