To create concise and impactful answers in UPSC Mains, candidates should focus on clarity and relevance. Structuring answers using headings and bullet points can help present information systematically. Being aware of the word limit, they should prioritize key points and support them with appropriate examples or data. Practice through timed writing sessions aids in developing brevity and ensures candidates can effectively convey their knowledge within the constraints. Lastly, regular evaluation of writing style and getting feedback from peers can enhance the overall quality of their answers over time.