I tell you from my experience: don't be nervous. Some examiners listen with their eyes closed. You have prepared scenic spots to draw lots at home. As long as you speak fluent Mandarin, the examiner won't embarrass you. If you are nervous, the questions asked after the explanation of the scenic spots will not be heard, but will affect your grades.
Don't wear too avant-garde clothes when you go to the exam. Many examiners are too old to accept it, but they don't need to be particularly formal (suits and ties). Ordinary clothes are casual. There are generally only two examiners in each examination room, so there is really no need to be nervous.
I wish you success in the exam.