After a phone interview, which was mostly about my motivation and CV but also some basic PPC knowledge, I was invited for an on site interview. Besides some questions about my CV they asked me a lot of questions about PPC. You need to know more than the basics and thoroughly research the product. They also asked me a question about the revenue of the Londen Eye. When calculating this (or any other calculation question they might ask), do not forget to include extra income like pictures etc. They give you a paper so you can write down how you are calculating the question.