Candidates can overcome anxiety during the UPSC interview by preparing thoroughly and employing effective relaxation techniques. Familiarizing themselves with common interview questions and conducting mock interviews can boost confidence and reduce uncertainty. Practicing mindfulness or deep-breathing exercises can help manage stress levels before and during the interview. Developing a positive mindset by visualizing success and focusing on strengths can further alleviate anxiety. Additionally, maintaining a healthy routine with adequate rest and nutrition leading up to the interview prepares candidates to present themselves effectively and clearly during the assessment.