General Study Manual

General studies manual is very important because it covers almost whole syllabus for the Prelims and will be useful in mains in some parts, it is also having Last years of Question papers as well as the breakdown of questions. Apart from this it will cover History, Geography, Polity, Economic & Social Development, Environment & Biodiversity, Science and GK. So this is Must buy book for all CSE or State PSC, Not only this book is useful for only CSE students but it is very important for Every Competition Exam where General Knowledge/General Studies is asked in the Exam and its One time investment. So Without any Doubt Go for this Book.

Although I will recommend Tata Macgrawill  manual then I rate Arihant's GS Manual 2nd best but There are GS manuals from other Publishers too if you want to have a look then click on the links below in the end of this post.

For English Medium People ( Hindi Medium Below English Medium ) :

Paper I : General Studies ( GS)

History, Culture, Freedom Struggle :

A History of Ancient and Early Medieval  / India's Ancient Past New /  The Wonder That Was India  (Ancient History) (Choose one )
History Of Medieval India  (Medieval History)
From Plassey to Partition : A History of Modern India / History of Modern India  (Modern History)
India’s Struggle For Independence – Bipan Chandra. (History)
Facets of Indian Culture – Spectrum. (Culture)

Geography:  

Certificate Physical and Human Geography – Goh Cheng Leong. ( Physical Geography)
Geography of India – Majid Husain / India: A Comprehensive Geography - D.R.Khullar / Here (Indian Geography) (Choose one)
World Geogarphy - Majid Hussain  (World Geography)
The Orient BlackSwan School Atlas / Oxford School Atlas  by Oxford University Press (Choose one)

Indian Polity : 

Indian Polity for Civil Services Examinations – M. Laxmikanth. (Polity)
Introduction to the Constitution of India - Durga Das Basu (Poilty)

Economic & Social Development : 

Indian Economy – Ramesh Singh. (Economy)
Economic Survey (2013-14). (Economy)
Yojna & Kurukshetra

Environment & Biodiversity : (Choose one)
Environmental Studies from Crisis to Cure 2nd Edition – R.Rajagoplan. (Environment)
Ecology and Environment - P. D. Sharma (Environment)
Environment & Ecology - Biodiversity, Climate Change and Disaster Management - Majid Hussain (Environment)
Tata MacGrawHill General Studies Manual : English / Hindi
The Economics Times

General Science : 
Science and Technology in India – Kalpana Rajaram : Spectrum. (Science and Technology)
Tata MacGrawHill General Studies Manual : English / Hindi

Current Affairs : 
India Year Book 2014. (Current Affairs)
Newspapers : The Hindu, The Indian Express, Frontline
Megazines : Civil Services Times

For Hindi Medium People :

Pracheen Bharat (Ancient History): (Choose one of them)
Pracheen Bharat Ka Itihas - V.D. Mahajan
Pracheen Bharat Ka Itihas - Shailendra Senger
Prarmbhaik Bharat Ka Parichay - Ram Sharan Sharma

MadhyaKalin Bharat (Medieval History):
Madhyakaleen Bharat - Rajniti, Samaj Aur Sanskriti by Satish Chandra

Aadhunik Bharat (Modern history): (choose one of these)

Palassi Se Vibhajan Tak : Adhunik Bharat Ka Itihas
Aadhunik Bharat ka itihas - Vipin Chandra

Bhartiya Rashtriya Andolan (Indian Freedom struggle) :
Bharat ka rastiya andolan- Vipin Chander

Bhartiya Sanskriti (Indian Culture):
Bhartiya Kala evan Sanskriti

Bhugol (Geography) Section:
NCERT +
Tata MacGraw Hill Samanya Adhayan (Hindi) is enough for NT Exam and HAS exam.

Rajvyavastha (Polity) Section:
Bharat Ki Rajvyavastha by Laxmikanth

Arthavayavsta (Economy) Section:
Bhartiya Arthavayavsta by Ramesh Singh

Science Section:
Tata MacGraw Hill Samanya Adhayan (Hindi) this will Cover Physics, Chemistry, Biological Sciences and Computer part.

Current Affairs : 
India Year Book 2014. (Current Affairs)
Newspapers : The Hindu, The Indian Express, Frontline
Megazines : Civil Services Times