Before your interview find out everything you can about the company (for example read their annual report), read through your application form again, thinking about the questions they might ask you. You should also prepare some questions to ask them.
To do well at the interview you will need to convince the interviewer you are qualified to do the job. You will also need to show that you are sufficiently motivated to get the job done well and that you will fit in with the company and the team in which you will work.
You should dress smartly for the interview and should leave home earlier than you need to on the day of the interview - you may be delayed by traffic or for other reasons. Be polite to all employees of the company. At the interview itself you must be positive about yourself and your abilities - but do not waffle