It is a very important information for Civil Services aspirants. There are several subject combinations which are not allowed by Union Public Service Commission in the Mains Exam. It would be better if the applicant prepares for the exam according the subject combinations which are permitted by UPSC. The list of combinations which a candidate can’t opt for in the Mains Exam is following:
Political Science & International Relations and Public Administration;
 Commerce & Accountancy and Management;
Anthropology and Sociology;
 Mathematics and Statistics;
 Agriculture and Animal Husbandry & Veterinary Science.
 Management and Public Administration;
 Of the Engineering subjects, viz., Civil Engineering, Electrical Engineering and Mechanical Engineering–not more than one subject.
 Animal Husbandry & Veterinary Science and Medical Science.