Yes, you should use the feedback and insights gained from mock tests to fine-tune your approach to presenting your answers in the Public Administration optional. Here's why:

1. Understanding the importance of effective presentation:
- Effective presentation of your answers is crucial in the UPSC examination, as it helps the examiner to navigate through your answers smoothly and comprehend your ideas clearly.
- Using headings, subheadings, and bullet points can make your answers more organized, structured, and visually appealing, which can enhance the overall impression of your answer sheet.

2. Enhancing readability and coherence:
- Headings and subheadings can act as signposts, guiding the examiner through your answer and indicating the different sections and subtopics you are addressing.
- Bullet points can help you present your points concisely and in a logical sequence, making it easier for the examiner to follow your arguments.
- This improves the readability of your answers and ensures that your ideas are presented in a coherent manner.

3. Highlighting key points and arguments:
- By using headings, subheadings, and bullet points effectively, you can emphasize the key points and arguments in your answers.
- Headings and subheadings can provide a clear structure to your answer, allowing the examiner to quickly identify the main ideas you are presenting.
- Bullet points can help you highlight important facts, examples, or arguments, making them stand out and leaving a lasting impression on the examiner.

4. Demonstrating clarity of thought and organization:
- Presenting your answers in a well-structured manner reflects your clarity of thought and organization skills.
- Effective use of headings, subheadings, and bullet points shows that you have a clear understanding of the topic and can present your ideas in a logical manner.
- This can enhance the overall quality of your answers and leave a positive impression on the examiner.

In conclusion, using headings, subheadings, and bullet points effectively can greatly improve the presentation of your answers in the Public Administration optional. It enhances readability, coherence, highlights key points, and demonstrates clarity of thought and organization. By incorporating these techniques based on the feedback and insights gained from mock tests, you can optimize your approach and increase your chances of scoring well in the UPSC examination.