In preparation for an interview, come ready to discuss your portfolio at length as well as your design process and what design software you are familiar with. Graphic design positions can be very specific to the company so make sure you brush up on the company's current design style and are ready to explain how your style and experience will mesh.
Its always good to know to work on Windows, Mac, Linux operating systems. And also it will be good to finish the task assigned in the given time, always try not to extend the given time and in case if its extended than the given output must accurately over come the more time taken by the person. Its good to answer to their question in as simple way as possible and always keep in mind not to show over smartness by giving extra answers.
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It is good to work on Windows, Mac, linux. Give task has to be completed in time. But sometime it may take extension of time because I work depends like that. at the time we should not think about the completing the work we should think about that satisfying the client.