Essential practices for maintaining focus and clarity of thought during UPSC preparations include regular breaks and a well-structured study routine. Aspirants should utilize productivity techniques like the Pomodoro Technique for better time management. Reducing distractions through a dedicated study environment and limiting digital interruptions is crucial. Engaging in relaxation techniques such as deep breathing or meditation helps clear the mind. Additionally, ensuring physical well-being through proper nutrition and adequate sleep fosters mental clarity, ultimately enhancing concentration.