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Have you looked into sitting extra Open University modules, like the Young Applicants in Schools Scheme? I'm in the same position, and I've taken on a YASS course as well as an extended project qualification you're free to define. We're told a focused and well-executed project in the area of your desired field of study is a great asset to a personal statement. As for slightly less academic pastimes, perhaps there's some kind of astrology group in your school or area? *shrug*