Past incidents that have shaped the present structure of UPSC examinations include various administrative reforms and judicial rulings that emphasized the need for transparency and fairness. The introduction of the Preliminary Exam and Mains format allows for a more comprehensive evaluation of candidates. Significant cases such as the Indra Sawhney case have influenced reservation policies affecting eligibility criteria. Revisions prompted by public scrutiny and the demands of changing societal norms have led to modifications in examination formats and syllabi that aim to better reflect the challenges faced by civil services today.