The Union Public Service Commission (UPSC) Civil Services Exam Syllabus is divided into three categories, namely Preliminary, Mains and Interview. The IAS syllabus can be found at the UPSC official website – https://upsc. UPSC Syllabus - Civil Services Syllabus · Comprehension. UPSC IAS Prelims & Mains Syllabus 2020: Check out Latest UPSC Civil Services Exam Syllabus 2020 in detail. IAS Syllabus is decided by Union Public Service Commission (UPSC) each year.