Essential skills for success in the UPSC interview include strong communication, critical thinking, and effective decision-making. Candidates should exhibit clarity of thought and the ability to articulate responses confidently. Adaptability and a calm demeanor under pressure are equally important, as they contribute to managing complex questions during the interview. Additionally, interpersonal skills play a critical role in establishing rapport with the panel. Demonstrating emotional intelligence and cultural awareness backing answers can significantly enhance prospects in the interview process.