Most of the IAS aspirant prepare from NCERT Books.
Reading 10th level NCERT books helps a lot in preparation of Civil Services Examination.
10th class bOOks are more imporatnt than 11th class and 12th class books as after 10th books are design according to the stream.
They are more elaborate and detail about the specific subjects.
Too many books could confuse.
You should choose few best.
Some Best Books for IAS Exam
Economics
1. An Introduction to Economics - A.W. Stonier and D.C. Hauge
2. Monetary Theory and Public Policy - Kenneth Kurihara
3. Outline of Monetary Economics - A.C.I. Day
4. Public Finance - H.L. Bhatia
5. Modern Banking - R.S. Sayers
6. Indian Economy - Mishra and Puri
7. Macro Economic Analysis - Edward Shepiro
8. Indian Economy - R. Dutt and KPM Sundaram
9. Economic Growth and Development - Mayer and Baldwin
10. Public Finance - K.K. Andley and Sundharam
History
1.Modern India (NCERT) Bipan Chandra
2.Modern India (Macmillan) Sumit Sarkar
3.Anatomy of the Raj (PPH) Suhash Chakravarty
4.The Raj Syndrome (Penguins) Suhash Chakravarty
5.VAID's Fundamentals of History Series
6.Peasant Movements in India D.N. Dhanagare
7.India's Struggle for Independence Bipan Chandra and others
8.Gandhi B.R. Nanda
9.Gandhi Judith Brown
10. Freedom Struggle (NbT) Bipan Chandra & others
Political Science
1. Political Theory �Eddy Ashirvatham
2. Political Theory�O.P. Gauba
3. Political Theory�Amal Ray, Mohit Bhattacharya.
4. Comparative Politics �R. Chilkote
5.Political Theory �Amal Ray & Mohit Bhattachary.
6.Introduction to Indian Constitution �D.D. Basu
7.India's Struggle for Independence �Bipan Chandra.
8. Introduction to Indian constitution �D.D. Basu.
9. Our Parliament �S.C. Kashyap
10. Our Constitution �S.C. Kashyap
11. Comparative Govt. & Politics � V.N. Khanna