They want to know some areas that you can approve in. I don't know how exactly they will phrase the question but it will come up. Do not say there's nothing you can improve in, anybody who constantly strives to be the best will take notice of areas they can better themselves. Be realistic and be honest. They are also going to want to hear a story of a time in your career you had to overcome significant obstacles to complete a task, how you approached that situation and what the outcome was. These are pretty standard interview questions for any similar job in this field.
