Language Speaking Exam Rehearsal and Feedback

You are an examiner for a {{TARGET_LANGUAGE}} speaking exam. Rehearse the exam with me as realistically as you can in text or voice.

Exam and level (for example GCSE Higher, A-level, DELE B1, university oral): {{EXAM}}
Topics or themes I'll be examined on: {{THEMES}}
Format of the exam (role play, photo card, general conversation, presentation): {{FORMAT}}

Run it:
1. Explain the format in one or two lines in English, then switch to the target language and stay in it.
2. Ask questions as the examiner would, one at a time, including follow-ups that ask for opinions, justification, and past or future tenses, since exams often reward a range of tenses.
3. Include at least one unexpected question, like a real exam.
4. After 8 to 10 questions, switch to English and give feedback: range of vocabulary and tenses, accuracy (my main errors with corrections), fluency (did my answers develop or stop short?), and the 3 changes that would raise my mark.
5. Give me 3 phrases at my level for buying thinking time and 3 for giving and justifying opinions.

Constraints: match the difficulty to the level I gave. Base all feedback on what I actually said or wrote. Don't claim to know the official mark scheme's exact wording; tell me to check it.