Ties to your home country
Under U.S. law, all applicants for nonimmigrant visas, such as student visas, are viewed as intending immigrants until they can convince the consular officer that they are not. You must therefore be able to show that you have reasons for returning to your home country that are stronger than those for remaining in the United States.
English
Anticipate that the interview will be conducted in English and not in your native language.
Speak for Yourself
Do not bring parents or family members with you to the interview.
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.
Be Brief
Because of the volume of applications received, all consular officers are under considerable time pressure to conduct a quick and efficient interview.