Techniques for mastering public speaking for the UPSC interview include practicing mock interviews, recording speeches, and receiving constructive feedback. Familiarity with common interview questions prepares candidates to respond confidently. Engaging in group discussions helps in developing articulation and clarity. Using effective body language enhances communication impact. Regularly participating in debates or public forums cultivates a habit of impromptu speaking, fostering quick thinking. Additionally, reading widely about various topics ensures candidates can provide well-informed answers, showcasing their knowledge and personality during the interview.