Proper attitude
A job interview is a mutual discussion so try not to think of it as an interrogation. Its purpose is for the company to know about you and for you to get to know more about the job and the company. Make the interview meaningful by being prepared. List down the questions you would like to ask beforehand and keep them in mind. Go with a positive attitude and look at each individual interview as a learning experience. If you fail at the interview assess why you think it did not go well and make improvements on yourself to be ready with the next interview.