The selection ratio of applicants to selected candidates in the UPSC Civil Services Examination (CSE) is typically around 1:400. This means that for every 400 candidates who apply, only one applicant is eventually selected for the civil services. This competitive nature reflects the rigorous standards and high aspirations associated with this prestigious examination. With a large number of aspirants each year, it becomes crucial for candidates to prepare effectively and strategically to enhance their chances of success.