How many subjects will I have to study for UPSC exam?

How many subjects will I have to give for UPSC exam?
thank you..

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hi,
CSE is split in to 3 stages namely preliminary,mains and interview.

prelims:
paper-1-general studies
paper-II-aptitude paper(csat)

mains:
optional subject-I(two papers of 300 marks each)
optional subject-II(two papers of 300 marks each)
GENERAL STUDIES-I(two papers of 300 marks each)
essay(200 marks)
language paper(qualifying nature)
english paper(qualifying nature)

so a total of nine papers.good luck

You can take any two subjects of your choice,
General studies
and
English are the compulsory subjects for the mains exams.