UPSC Optional Subjects Combination

I want to know about optional subject combination of Union Public service commission so please tell me about this if you know about this if you know about this then please tell me about this

[Arvind Kumar]

Choice of optional Subjects is a major Issue Every Student faces in the Reputed IAS Exam Conducted by UPSC. According to recent Changes made by government in the Pattern of IAS exam, the preliminary Test has now been replaced by Civil service aptitude test (CSAT), which will comprise of two objective papers for all students carrying Equal marks.

For the mains exam, Along with 5 compulsory papers (two for general studies, one for essay, for a language from 18 optional languages) and one for qualifying English and, candidate has to choose two subjects from a list of 25 optional subjects.
Following are the not allowed combinations in the UPSC syllabus-

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,
Any TWO branches of Engineering,
Medical Science and Animal Husbandry Veterinary Science,
Combination of TWO Literatures