The short answer has three parts:
- The listening texts are in Swiss Standard German — standard German with a Swiss colouring: not dialect, but not the German of Germany’s Tagesschau either.
- The examiner conducts the interview in High German.
- You may, per the regulations, answer in High German or in Swiss German/dialect.
What that means for preparation
- Train listening with Swiss sources (e.g. SRF), not only material from Germany — pronunciation and melody differ audibly.
- If you’re only used to Germany’s standard German, spend a few hours deliberately tuning your ear to Swiss Standard German before the test.