UPSC

Hi Vivek,
Even though the exam to be undertaken is popularly known as IAS exam, it is officially called UPSC Civil Services Exam. The UPSC CSE consists of 3 stages Prelims, Mains, and Interview. Getting into Indian Administrative Service is not easy considering the competition involved, but not impossible for a candidate with right attitude and approach.
UPSC (Union Public Service Commission) is the government agency responsible for selecting the right candidates for this service. Every year only around 1000 candidates are selected for all the 24 services combined. The number of candidates who applied for UPSC Civil Service Exam was about 9 lakh in 2015, out of which around 4.5 lakh candidates appeared on the exam day.
This exam is widely considered as the toughest exam in the world, considering the exam duration (extends 1 year), depth of the syllabus and the competition involved. The first stage of the exam Preliminary (objective) is usually conducted around June, while the second stage, Mains (written), is conducted around October. Those who clear Mains will have to face interview/personality test during the March-May period. The final result
usually comes in June.
A disciplined and focused mind with a passion for learning and reading is the basic trait of all successful candidates. The UPSC Civil Services exam is more a test of the analytic and presentation skills along with knowledge gained by the candidate rather than a test which checks candidates mathematical or verbal skills. To clear IAS, we feel two entities as essential:
Right guidance for prelims and mains.
Right study materials and books.
Some of the important books are:
History of Modern India Bipan Chandra (History)
Indias Struggle For Independence Bipan Chandra (History)
History Of Medieval India Satish Chandra (History)
Indian Art and Culture Nitin Singhania (Culture)
Geography of India Majid Husain (Geography)
Oxford School Atlas Oxford (Geography)
Indian Polity for Civil Services Examinations M. Laxmikanth (Polity)
Indian Economy Ramesh Singh. (Economy) or Mrunal Video Lectures
Economic Survey (Economy)
Science and Technology: Follow current affairs
Environmental: Shankar IAS Environment Book
India Year Book (Current Affairs)
Manorama Yearbook (Current Affairs)
For CSAT:
CSAT Paper 2 Manual by TMH or CSAT-II Arihant (CSAT Paper 2)
Analytical Reasoning M. K. Pandey (CSAT Paper 2: Analytical Reasoning)
Verbal & Non-Verbal Reasoning R. S.Aggarwal (CSAT Paper 2: Reasoning)

Hi Vishal,
For the UPSC and other government examination, the general eligibility criteria is:
The candidate must hold a pass Bachelors degree from any of the Universities incorporated by an Act of the Central or State Legislature in India or other educational institutions established by an Act of Parliament or declared to be deemed as a University, under Section-3 of the University Grants Commission Act, 1956, or possess an equivalent qualification.
Candidates who have appeared or intend to appear for the final examination and are awaiting results are also eligible to apply for the Preliminary Examination/other government examination such as CDS/CAPF/SSC.