I took it for Chinese - 30min conversation. Although I don't remember most of the questions the person asked me, the questions for me were fairly conversational: what I do, company I work for, My interests, why I am interested in the country and language, etc.. After you sign up for the language exam (30 min phone convo), you can even go to the website and listen to recordings of people at various language proficiency levels.
Be prepared to converse with a native speaker in a meaningful conversation (could be about you, the country of interest, and anything in between), and practice with a native speaker if possible. This is not an admission interview! So don’t worry about answering questions like why W/L, why now, etc.. They won’t test your knowledge about the school in a foreign language. They are only assessing your language proficiency.