Filled out my request for a university student from Denver, Colorado. I am awaiting a response. to proceed to the next step of filling the visa formularion and thus send it to the American Embassy in ...
Don't be nervous.
Talk with confidence
make eye contact.
Be polite and thankful
Do not volunteer more than they ask for.
Appreciate about USA ad it' life.
Do not argue
Don't be defensive
Tell the truth!
Bring your supporting documents (the embassy or consulate's web site probably has some suggested documents) in case the consular officer asks for them
If you are refused, it is unfortunate, but do not take it as a personal value judgment. Unless the officer is absolutely satisfied that you're coming back home, he or she is supposed to refuse you.
So, assuming you are planning to return, think of why it is you want to come back to your country, and be prepared to explain that.