It would help if you let us know more about your situation. Timeline and local office could be useful to others. It all depends, is your application based on 3 years marriage, or 5 years? Do you have any arrests in your past? Again, you have an entire month to do some browsing for other people experiences. Unfortunately (or fortunately) in this forum you get the advice you paid for. I would actually claim that the token currency in this forum is information, sharing of information, the more you give, the more you get back. It might mean that you share on an interesting experience, or you have a particular circumstance in your case and people jump up and down with suggestions. However, a plain, what should I take to the interview and what are they going to ask me just don't cut it. Again, please share more details about your timeline and application and you'll probably get better replies.