UPSC

The Union Public Service Commission (UPSC) is India's central agency authorised to conduct the Civil Services Examination, Indian Forest Service examination, Engineering Services Examination, Combined Defence Services Examination, National Defence Academy Examination, Naval Academy Examination, Combined Medical Services Examination, Special Class Railway Apprentice, Indian Economic Service/Indian Statistical Service Examination, Combined Geoscientist and Geologist Examination, and Central Armed Police Forces(Assistant Commandant) Examination. In all above mentioned examination candidates get Class I job in selected cadre. For example if you get selected in Civil Services, you will get job in IAS, IFS, IPS and allied services. If you get commission in Defense services you will start your career as Lt and equivalent. In paramilitary forces you will start as Assist Commandant.

The Union Public Service Commission (UPSC) is India's central agency authorized to conduct the Civil Services Examination, Indian Forest Service examination, Engineering Services Examination, Combined Defense Services Examination, National Defense Academy Examination, Naval Academy Examination, Combined Medical Services Examination, Special Class Railway Apprentice, Indian Economic Service/Indian Statistical Service Examination, Combined Geoscientist and Geologist Examination, and Central Armed Police Forces(Assistant Commandant) Examination.
The Maharashtra Public Service Commission (MPSC) is a body created by the Constitution of India to select applicants for civil service jobs in the Indian state of Maharashtra according to the merits of the applicants and the rules of reservation.
Most of the jobs examination conducted by UPSC is are for Central Class I services where MPSC conducts exams for state Class II and below jobs.

Books that you can consider-
A. Paper I - General Studies
1. History (Indian History and Indian National Movement)
Essential:
NCERT books IX, X, XI, XII
Modern India by Bipin Chandra
2. Geography (Indian and World Geography)
Essential:
NCERT books IX, X, XI, XII
General Principals of World Geography by Charles Farro
School Atlas
3. Economics (Indian Economics and Economic Theory)
Essential:
An Evolution of Indian Economy by I.C. Dhingra
Economic Survey of India by Govt. of India
Economic Dictionary by Penguin
4. Polity (Indian Constitution)
Essential:
An Introduction to the Constitution of India by D.D. Basu
5. General Science (Physics, Chemistry, Biology)
Essential:
NCERT books IX, X
6. Environment (Ecology, Bio-diversity, Climate Change)
Essential:
Biology and Geography NCERT Books plus current events on Environmental Issues
7. Current Affairs
Essential:
Hindu and Economic Times Newspapers
Front line, Political & Economic Weeks Periodicals
B. Paper II – Aptitude
1. 0NCERT Mathematics VII, IX, X/
2. Data Interpretation and Data Sufficiency by Tyra and Kundan
3. Objective General English by R.S. Agarwal.
4. A Modern Approach to Verbal Reasoning by R.S. Agarwal.
5. A new Approach to Reasoning by Sijwali and Sijwali
Preparing for UPSC requires combination of smartness and hard work. Do the right things to gain an edge over your competition:
*Get the right books for Prelims.
*Start preparing at least 10 months before.
*Solve past year questions to test yourself on regular basis.
*Cover the scoring sections early.
*Cover the syllabus strategically. Don't go for a "prepare all" approach for prelims.
*Balance paper 1 and 2.
For more information you can refer to the below mentioned links:
http://www.upsc.gov.in/exams/notifications/2013/csp_ifs/csp2013.pdf
https://www.shiksha.com/getArticleDetail/192/Civil-Services-Entry