Hello,

In order to appear for UPSC, you need to pass Bachelor's Degree in any discipline from a recognized University, there's no specific aggregate required in this case, you can apply even in the final year, you need to be 21years old.


UPSC Civil Service Exam consists of three stages-

Preliminary
Mains
Interview

To give you a brief about the exam;

Preliminary consists of 200 Marks for each paper in MCQs format,
you just need to score the required cut offs against your category in first paper, overall its numbers aren't added in the final list.

It mainly consists of GS Paper-I with topics such as History of India and Indian national movement, Indian and World geography, Economic and social development- sustainable development, poverty,inclusion demographics, social sector initiatives etc,Indian polity and governance-constitution,political system,Current Events nationally and Internationally, General Science,General Issues on environmental ecology,biodiversity and climate change. you just need to score the required cut offs against your category.

And then we have qualifying CSAT(you need to score 33%, only 66 marks out of 200) which includes topics such as basic numeracy, comprehension, logical reasoning and analytical ability, general mental ability, decision making and problem solving, interpersonal skills including communication skills.


Coming to Mains it's more of a subjective type, one needs to write answer for Four General Studies Paper such as

GS-I includes Indian Heritage and Culture,History and Geography of the World and Society,
GS-II includes Governance, Constitution, Polity, Social Justice and International Relations,
GS-III includes Technology, Economic Development, Bio-Diversity, Environment, Security and Disaster Management,
GS-IV includes Ethics, Integrity, and Aptitude

In addition to four GS Papers, there are two optionals, one essay, two language paper, there are total nine papers here. 250 marks for each paper, total is 1750 marks followed by Personality Test of 275 marks.