Because of the volume of applications received, all consular officers are under considerable time pressure to conduct a quick and efficient interview. They must make a decision, for the most part, on the impressions they form during the first minute of the interview. Consequently, what you say first and the initial impression you create are critical to your success. Keep your answers to the officer's questions short and to the point.
Know the Program and How It Fits Your Career Plans
If you are not able to articulate the reasons you will study in a particular program in the United States, you may not succeed in convincing the consular officer that you are indeed planning to study, rather than to immigrate. You should also be able to explain how studying in the United States relates to your future professional career when you return home.
Speak for Yourself
Do not bring parents or family members with you to the interview. The consular officer wants to interview you, not your family. A negative impression is created if you are not prepared to speak on your own behalf. If you are a minor applying for a high school program and need your parents there is case there are questions, for example about funding, they should wait in the waiting room.
Maintain a Positive Attitude
Do not engage the consular officer in an argument. If you are denied a student visa, ask the officer for a list of documents he or she would suggest you bring in order to overcome the refusal, and try to get the reason you were denied in writing.
Anticipate that the interview will be conducted in English and not in your native language. One suggestion is to practice English conversation with a native speaker before the interview, but do NOT prepare speeches! If you are coming to the United States solely to study intensive English, be prepared to explain how English will be useful for you in your home country.