The UPPCS exam format differs from the UPSC exam structure primarily in the number of papers and the overall emphasis. While both examinations assess a candidate's knowledge across various subjects, UPPCS typically includes fewer papers with a more simplified syllabus compared to UPSC. UPSC has a two-stage exam process (Preliminary and Main), while UPPCS may have fewer stages and different subject weightings. The marking schemes can also vary, with UPSC placing significant emphasis on critical analysis and essay writing, while UPPCS may focus more on factual recall and objective-type questions.