Introduction:
The Civil Engineering optional subject exam in the UPSC requires precise and concise answers to score well. Here are some specific tips to help you write effective answers in this exam:

1. Understand the Question:
Make sure you carefully read and understand the question before attempting to answer. Identify the key points and requirements of the question to ensure you provide a relevant response.

2. Plan your Answer:
Take a few moments to plan your answer before you start writing. Jot down the main points or structure your answer in a logical sequence. This will help you organize your thoughts and ensure a coherent response.

3. Stick to the Word Limit:
Keep in mind the word limit specified for each question and strictly adhere to it. Practice writing answers within the given word limit to develop the skill of being concise.

4. Use Headings:
Use appropriate headings to break down your answer into different sections. This not only makes your answer visually appealing but also helps the examiner locate specific points easily.

5. Utilize Bullet Points:
Use bullet points to present your key ideas or arguments. This makes your answer more readable and helps in emphasizing important information.

6. Be Direct and to the Point:
Avoid unnecessary elaboration and focus on providing direct and precise answers. Stick to the main points and avoid irrelevant details to save space and maintain conciseness.

7. Use Examples and Diagrams:
Whenever suitable, provide examples or diagrams to support your answer. This not only adds clarity but also saves words by conveying information visually.

8. Revise and Edit:
Before submitting your answer, take some time to revise and edit it. Remove any redundant or repetitive information and ensure that your response is clear, concise, and error-free.

In conclusion, writing precise and concise answers in the Civil Engineering optional subject exam requires careful planning, adherence to word limits, effective use of headings and bullet points, directness, and clarity. Practice these techniques to improve your answer writing skills and increase your chances of scoring well in the exam.