i am not being rude, but the way he is asking here shows that he had not searched anything about USMLE by himself. If he simply google it, he will find so many good answers of what he is looking for than information provided by anyone from here. Had he googled about USMLE, more than what he asked for. 

USMLE is one of the hardest exam if one has to give. You need to have so much preparation, you need to devote such a long time for it. Its not like a joke, u need to be professional  for this.