There is one thing you need to do before the actual interview, is to get interviewed. Means, you should prepare yourself through practice interview or mock interview. Very few people do it before their actual interview. By doing so, you can set yourself apart from the competition. You can get constructive feedback from the mock interviewer so you can overcome the weaknesses you will likely to have in your real interview.
You will also get fluent in answering the difficult question if you practice sample questions. But, remember do not try to cram the answers of the interview questions, just remember them naturally.
