No matter how qualified you are for a certain job, mishaps during the application process can automatically disqualify you.
Every job interview follows more or less the same structure with typically modules.
1. Tell me something about yourself....
2. Strong points and weak points
3. Why should we employ you instead of somebody else?
4. Why do you want to work in this position?
5. What do you expect of this position and our company?
6. Please tell me about your recent responsibilities
7. Why do you want to leave your old job?
8. Why do you want to work in Germany?
9. Which goals do you want to achieve in the next five to ten years?
10. What salary do you have in mind?