Candidates can improve their writing skills for the UPSC Mains by consistently practicing and receiving constructive feedback. Regularly writing essays and answers to previous year questions helps candidates refine their style, structure, and clarity. Focusing on key components like introduction, body, and conclusion is essential. Timed writing exercises can enhance speed and efficiency. Reviewing and analyzing high-scoring sample answers is beneficial to understand what examiners expect. Additionally, reading widely across subjects enhances vocabulary, comprehension, and idea generation, ultimately leading to more robust writing skills.