How to apply for Civil Service Exam? How to prepare for it? Recommend few good books for same. On what basis should we select optional subjects?

Hi Friends,
I know little about civil service exam, I want to know more about it regarding how to apply, how to prepare, any recommended books...
On what basis we need to select optional subjects is there any criteria for that.

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Dear

Civil Service Exam conducted by UPSC Every Year.

Before apply you should read eligibility for this:

Age Limit :

For General Candidate 21-30 years
For OBC Candidate 21-33 years
For SC/ST Candidate 21-35 years

Educational Qualification:

Candidate should be graduate from any recognized university.

There is no percentage required.
Final year candidate can also apply.


Attempts:

For General Candidate 4
For OBC Candidate 7
For SC/ST Candidate No Limit

Examination:
Preliminary
Main
Interview

For Examination you would be work hard
You should read news paper
You should solve previous question paper
you should read magazine
your should read NCERT Books
You should related books likes:
Upkar Prakashan
Arihant Expert
R.S Agarwal etc

Best of Luck