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Whichever course you decide to take, it is important that you choose the one you enjoy the most. You are going to be on this course for 3-4 years, writing long essays, presentations, exams, etc on this subject, so you need to make sure you're passionate about the subject you choose, otherwise it's going to be a very tough few years.
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Do some research, there might be some degree programmes out there that offer a dual-degree course of Psychology and Criminology together. I know here at LJMU we offer Forensic Psychology, which kind of merges some of the criminology modules and some of the psychology ones.
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If you are torn between the two subjects, you could do one as an undergraduate course and the other as a postgraduate course.
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I'd also suggest to attend as many open days and applicant days as you can and ask these questions there, because once you are in a university environment, experiencing taster sessions, it might make it easier for you to decide?