Watch the following video closely. From the comment the speaker makes, the need to prepare for a job interview is clear.
Now look at the other videos, each giving you a general question you can expect on a job interview.
It is important to prepare some general questions about yourself before you go to the job interview. You need to remember that this job interview is all about you, so you need to know your strengths and weaknesses. Preparing your questions gives you the opportunity to come up with the best examples and allows you to feel more comfortable and relaxed.