Practices that help strengthen the ability to argue in written form for UPSC include structured essay writing, engaging in debates, and critically analyzing prompts. Regularly practicing writing under timed conditions allows candidates to articulate arguments clearly and concisely. Debating enhances persuasive skills and challenges aspirants to consider multiple perspectives. Analyzing various essay topics helps in developing a structured approach to presenting well-reasoned arguments. Additionally, feedback from mentors or peers can refine writing skills, making arguments more compelling and coherent.