The consular will not ask you such question because you are an intending immigrant under the DV lottery programme, so whether you decide to finish your studies here or not depends on you. Also you have no problems about the add. used ok? Just your other credentials must be genuine.. Goodluck
I disagree with you on this one. How do you know the questions this fellow is going to ask? Remember that in as much as these people are there not intimidate genuine winners, however, winners be must prepared to answer any questions thrown at them from the evidence they present.