Candidates can integrate essay writing into their UPSC exam preparation by practicing regularly and focusing on varied topics. They should analyze previous years' questions to understand common themes and styles. Dedication to planning and structuring essays with clear introduction, body, and conclusion is essential. Engaging in peer reviews can provide constructive feedback. Additionally, using current issues, socio-economic trends, or government policies can enrich the content. Setting aside specific times for essay writing within their study schedule promotes the habit and enhances writing skills essential for the Main Examination.