The selection process for the Indian Administrative Service (IAS) through UPSC involves three stages: the Preliminary examination, Mains examination, and the personality test. The Prelims consist of two objective-type papers that test candidates' general studies knowledge. Those who qualify move on to the Mains, which comprises nine papers, including compulsory languages and elective subjects. Finally, successful candidates are called for the personality test, where their suitability for administrative roles is assessed. The overall performance across all stages determines selection for the IAS.