Effective ways to practice critical writing for the UPSC exam include maintaining a structured approach. Aspirants can begin by regularly composing essays on diverse topics, focusing on clarity and coherence. Reviewing previous year's question papers helps in understanding the exam format. Participating in written discussions with peers enhances the writing process through constructive feedback. Incorporating a variety of sources for data and arguments strengthens analytical skills, ensuring well-rounded responses that can meet the demanding criteria of the UPSC exam.