Improving writing styles can significantly influence essay scores in the UPSC mains by enhancing clarity and coherence. Focusing on structure (introduction, body, conclusion) and employing a clear, concise language can make arguments more compelling. Utilizing transition phrases improves the flow of ideas, enabling a coherent narrative. Regular practice with feedback from mentors helps in refining writing skills. Moreover, integrating relevant examples and case studies strengthens arguments, demonstrating a comprehensive understanding of the topic and enhancing overall essay quality, which is crucial for high scores.