As you want here I am providing list of good books for preparation of TNPSC exam

i)Social Science Books - 6th to 10th Std
ii)Science Books - 6th to 10th Std, (Additional 11th,12th Botany and Zoology if you have time)
iii)Polity - 11th,12th Political Science
iv)Economy - 11th,12th Economics Books
v)Geography -11th,12th Geography Books
vi)Indian Culture - 12th Indian Culture Book

2.History
i) Prof.J.Dharmarajan's Tamilnadu History
ii)K.Venkadesan. India Freedom Struggle
iii) History of Modern India Bipan Chandra Bipan Chandra

iv) India's Struggle for Independence Bipan Chandra

3.Indian Polity
i)Lakshi Kanth - Indian Polity
ii) India Arasamaippu Poti Thervu Kalanjiyam by Dr.Shankara Saravanan

4.Indian Economy
i) Indian Economy for Civil Services Examinations by Ramesh Singh

5.Geography
i)Oxford School Atlas
ii)Geography of India by Spectrum Publication

6.Tamilndu Language and Culture (Mains Exam)
i)தமிழ் இலக்கிய தகவல் களஞ்கியம் - தேவிரா
ii) தமிழ் இலக்கிய வரலாறு - மு . வரதராஜன்

7.Current Affairs
i)The Hindu, Dinamani,
ii)Competitive Success Review/Civil Service Chronicle/Competition Wizard/Shankar IAS Acadamy's Civilpedia(any one of these magazine)
iii)Yojana/Thittam

8.Science & Technology
i)Science & Tech by Spectrum Publications

9.India Year Book 2014 - by Government of India

10.Aptitude (50 marks in Group 1 Exam)
i)A Modern Approach to Verbal Reasoning by R.S. Aggarwal
ii)Quantitative Aptitude by R.S.Aggarwal
iii)Objective Arithmetic - R. S. Agarwal

11.Guide Books for General Studies (Not Important, if you study all the above mentioned books). Any one of the Guides like Tata Mc Graw Hill, Spectrum or Pearson

Arihant General Knowledge Book is almost a comprehensive for TNPSC GK Portion. It is referred by all TNPSC Coaching Centres.

12.General Tamil Books ( Pothu Tamil )
i)Pothu Tamil Kalanjiyam TNPSC Pothu Tamil Puthiya Pada thittam by Shankara Saravanan

13.General English Portion Books
i) First you should cover all syllabus oriented portions of State Board Books 6th - 12th Standards.
ii)Objective General English by R.S. Agarwal

14. Other TNPSC Exam Books Available in the Market (Optional to buy)

i) Pothu Arivu Kalanjiyam TNPSC GROUP-1,Group-2 by Shankar Saravanan
ii) India Kaiyedu UPSC TNPSC Muthanmai Thervu Thayaripukana Karuvi Nool by Dr.T.Ramar Dr.Shankara Saravanan
iii)TNPSC GROUP -II and II A (EM) by V.V.K.Subburaj
TNPSC VAO - ADMINISTRATION by V.V.K.SUBBURAJ (2014)
iv)TNPSC Gr. I (Preliminary) Exam by V.V.K.Subburaj
v)TNPSC Group - IV (Special Competitive Exam) by V.V.K.Subburaj
vi)TNPSC Gr. IV (Tamil) by V.V.K. Subburaj
vii) TNPSC GROUP-II-TM by V.V.K.Subburaj
viii)Challenging Science Questions and Answers by V N Girija
ix)TNPSC Group - 4 by Ezhil Krishnan
x) Athiga Mathippen Pera Ariviyal Vina Vidai(TNPSC, UPSC, TANCET, GMAT Q&A) by V.N. Girija
xi) TNPSC குரூப் 2 முதன்மை தேர்வு by ஷாஜிதா ஹீமாயூன்
xii)VAO (Village Administrative Officers' Exam) EM by V.V.K. Subburaj
xiii) TNPSC Group 2 by Prof. Veerasekaran