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Be the person that you want to be. Do the things that you enjoy doing. Academics is still the most important thing for getting into college. If there are ECs that you enjoy, you can join now. Don't do them for college, do them because that is how you enjoy spending your time. If you don't enjoy spending your time on any of them, find something else that you enjoy spending your time doing. Live a little, explore things, develop yourself. Get out from in front of the computer.