A face to face interview.

Yesterday I went to Changsha for a interview ,as applying for a position be an assistant.After that I thought it was far away from my imagination.So weak of my theory that I did a badly performance.It really tells me that difference between school and society.As following is my experience:
First,you'd do some paper to prove that you really acquire something.
Second,he or she will ask you some question about your understanding with what you're good at.
As I know,the second step is the most important.You must have a fast and good thinking to make a good answer.
Thanks.