Admin assistant job interview tomorrow

I have an interview for a temporary job as an admin assistant for a book publishing company tomorrow. I’ve been really bad at interviews (I’ve had three for paralegal jobs and didn’t get any). What should I prepare for? I plan on going to law school, should I tell them I’m hoping to use this experience to get a job in the legal field? I’m not passionate about books either. I just really need my first job after college and this company is very popular so it would look pretty good on my resume.

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