The general application process is the following:
1. CV screening
2. Excel exam (1 hour to complete)
3. Panel interview with the team you will be working for
4. Interview with the manager
The interview with the panel is usually divided in 3 parts. The first part is general introduction and questions related to the role you applied. Next is the technical questions. This may vary dependng on the role you applied. For research jobs, you will be asked about the data that the team produces, the report that the team publishes, or other general economic terms. Last is optional depending on the role/your CV, which is the language test. If you are a B2 or higher, you will have no issue passing this part.