Read about the employer beforehand, for example on their website. Think about how you can bring out your skills and suitability for the task. Practise describing your background and professional skills in a few sentences.
Think in advance what questions the employer may ask you. Practise answering common job interview questions. The employer must not ask you about your family, what religion you practise or whether you are politically active.
Let the employer see that you have looked beforehand for information about the employer’s organisation and the position and that you are genuinely interested in this particular job. Think also about what you would like to ask the employer.
For more information about job interviews, see here.