The purpose of the preliminary examination in the UPSC Civil Services process is to screen candidates for the subsequent stages of the exam. It consists of two objective-type papers focusing on general studies and aptitude. The preliminary exam serves as a qualifier, determining which candidates will advance to the mains examination. This stage assesses candidates’ understanding of various subjects and their ability to think critically and analytically. By filtering out unqualified candidates, the preliminary examination ensures that only those with the necessary knowledge and skills progress in the rigorous selection process for civil services.