A candidate can attempt the UPSC Civil Services exam a maximum of six times if they belong to general category. OBC candidates have a limit of nine attempts, while SC/ST candidates have no upper limit as long as they stay within the age criteria. Additionally, candidates from the economically weaker sections (EWS) are subject to the same attempt rules as the general category. These attempts provide aspirants multiple opportunities to clear the examination, thereby allowing them to refine their preparation strategies and enhance their chances of success.