Inter- and intrapersonal skills are crucial for UPSC success as they enhance a candidate's ability to communicate, interact, and present themselves effectively. Intrapersonal skills help candidates to stay focused, maintain self-discipline, and motivate themselves during extensive study periods. Conversely, interpersonal skills facilitate better communication in group discussions and interviews, where candidates need to express their views clearly. These skills can improve understanding during the personality test, significant for final selection. Thus, developing both skill sets can lead to improved performance and overall success in the UPSC examination.