THE MOST IMPORTANT FACTOR
Let me tell you something. The most important factor is "CONFIDENCE". Nothing can depose that. Whatever the answer be, if you are confident and show that you aren't nervous a bit, that will really help you get through. Complete Documents, Convincing Skills, Confidence and Present mindedness is what you have to invest. These are the keys to getting through the interview successfully. Many do get through coz of sheer luck, when some of the casual officers just seem to be in a hurry to get through with the troop of VISA aspirants facing their counter. But then I believe that your parents do all the job of putting together all the financial documents and stuff. The only thing you need to do is to put a confident self of yours over there. Its not that All the questions i have put here are the only ones, they might come up with any other alien stuff. But then present mindedness and spontaneity is what helps under those situations. You have to be prepared with an answer the moment he shoots a question at you. Dont make a face as if you just committed a sin. Hand over the documents and look at him. Remember , all your documents are as genuine as your Birth-Certificate;).