I might also add that I would expect an applicant these days to have researched the company he/she is interviewing with. You need to come in to the interview with an idea of their products, their customers and a top level understanding of the technology involved. I would assume that if you didn’t know at least that that you really aren’t interested in the company/job.
You should also clean up your facebook page (if you have one) or any other social media. The companies will be looking at all that. Pictures/stories that show you drinking/drunk etc. aren’t going to sit very well with your potential employer.