They offer a scrupulous test assignment before the interview to test your knowledge of the processes and language fluency. I did not pass, but I enjoyed the test. It gave me a better understanding of the position and whether I fit the role. Communication with the recruitment staff was smooth and pleasant.

Extensive written task before the interview, strong focus on processes. Written task has to contain as much details as possible, otherwise you will not be considered. It also had a test on writing/editing skills, but it looks like the main criterion of acceptance were 'giving the answers they expect' applying technical abbreviations, professional slang etc.