It is very important to answer the instructor's questions politely during the postgraduate entrance examination re-examination. Here are some suggestions:

1. Stay calm and confident: When facing the instructor’s questions, you must first stay calm and confident. Don't stutter or be incoherent because you're nervous, as this will leave a bad impression on your instructor.

2. Listen carefully to the question: Before answering the question, make sure you fully understand the instructor's question. If there is anything unclear, you can ask the instructor for help to ensure the accuracy of the answer.

3. Be concise and clear: When answering questions, try to be concise and clear and avoid lengthy statements. You can briefly summarize the problem first, and then elaborate on your views and opinions.

4. Clear logic: When answering questions, keep your logic clear so that the instructor can clearly understand your point of view. You can use some connectives, such as "first", "secondly", etc., to organize your answers.

5. Give examples: When answering questions, you can give appropriate examples to increase the persuasiveness of your answer. But pay attention to the choice of examples to ensure they are relevant and appropriate to the problem.

6. Answer honestly: When answering a question, answer honestly and do not try to avoid the question or make up your answer. If you really don’t understand a certain issue, you can tell your instructor frankly and express your willingness to learn relevant knowledge.

7. Pay attention to your tone and expression: When answering questions, pay attention to your tone and expression, and stay polite and respectful. Don't appear impatient or dismissive.

8. Conclusion: At the end of answering the question, you can express your gratitude to the instructor for the question and express that you will continue to work hard to achieve better results in future studies.

In short, during the postgraduate entrance examination re-examination, politely answering the instructor's questions is an important way to show one's comprehensive qualities. Through the above suggestions, I believe you can leave a good impression on your tutor.