This is a complicated question. You need to understand why they are asking these things, and how to best present yourself and your value to them.. Preparation and practice are the keys.. I can help, if you are looking for a teacher.

Practice, practice, practice. Ask a friend to give you a job interview. Even if it isn't exactly like a real one, it will still help. Use something to record video of yourself. It can be unpleasant but you will be amazed by what you notice about yourself.