Past UPSC toppers recommend addressing exam stress through effective time management and self-care practices. They advocate for a balanced study routine that incorporates breaks for mental rejuvenation and physical activities to enhance focus. Mindfulness techniques like meditation and deep-breathing exercises help maintain calmness during preparation and the exam itself. Additionally, sharing experiences with peers can relieve pressure and foster motivation. Maintaining a positive mindset and setting realistic goals are also emphasized to reduce anxiety and improve performance.