Civil Services preliminary exam Eligibility criteria

Can you tell me the Civil Services preliminary exam Eligibility criteria???

[Quick Sam]

Civil Services Examination is conducted by the Union Public Service Commission (UPSC). Here I am giving you the details of this exam:

Nationality:
A candidate must be a citizen of:
A citizen of India, or
A subject of Nepal, or
A subject of Bhutan, 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 hold a degree of any of Universities incorporated by an Act of the Central or State Legislature in India

Physical requirements:
Minimum height of 165 cm for Men and 150 cm for Women
Min Chest girth fully expanded: 84 cm for Men and 79 cm for Women. Expansion of 5 cm for Men and Women.
Total amount of Myopia (including the cylinder) should not exceed minus 4.00 D and total amount of Hypermetropia (including the cylinder) should not exceed plus 4.00 D
Presence of Squint is a disqualification

Some good books for the preparation of Civil Services Preliminary Examination: