My sister got accepted in one of the university  in US and she also got the  US visa.  Her professor had told her that first get the visa then we will talk about the assistantship. But now he is telling her that he cant give her any assistantship in first semester  but he will give one in next semester. If she cant get the assistantship, she cant afford  to pay the tuition.

  Is it possible to come to US one month before the classes start and then apply to some affordable
community college without joining the university for which you got the visa for?