Hey Amar
Civil Services Examination isn't focussed on the branch of the candidates whether it is Science, Commerce or Humanities. There are different departments in Civil Services that govern and work in different fields as formed depending upon the need and duties. Services that are closely related to Commerce are:
Where in after qualifying UPSC Civil Services exam a candidate can work as an A class officer in the above mentioned departments.
For further doubts, ask us.
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