Student of any stream can appear in the Civil Services Examination, there is no particular stream is required. It is conducted by UPSC every year. Here I am giving you the details of this examination:


Nationality:
A candidate must be a citizen of:
A citizen of India, or
A subject of Bhutan, or
A subject of Nepal, or
A Tibetan refugee who came over to India before 1st January, 1962 with the intention of permanently settling in India, or
a person of Indian origin who has migrated from Pakistan, Sri Lanka, Burma, East African countries of Kenya, Uganda, the United Republic of Tanzania, Zambia, Malawi, Zaire, Ethiopia and Vietnam with the intention of permanently settling in India.


Required qualification:
The applicant should have completed Degree of any of Universities incorporated by an Act of the Central or State Legislature in India


Some good books for the preparing:
NCERT Books
Indian History – Class XI & XII
Indian Geography – Class VI to XII
Science – Class IX & X


Indian Polity [constitution]
Indian polity - by Laxmikanth (TMH publications)
Introduction to constitution of India – D.D. Basu
Indian Constitution – P.N. Bakshi /


Indian Economy
Pratiyogita Darpan (Latest Edition) and Economic survey [2009-10]


Prelims Guide
Any Standard Guide available in the market like Tata McGrawHill, Spectrum


Other Sources
Regular watching of TV News (NDTV, BBC, CNN, and DD) and reading general magazines like India Today, Outlook and Sunday Indian etc.