Tamil Nadu public Service Commission Conducts the Recruitment Examination Group I for the Recruitment of the Following posts that are :

Deputy Collector
Deputy Superintendent of Police (Category-I)
Deputy Registrar of Co-operative Societies
Assistant Director of Rural Development Department.
Assistant Commissioner in the Hindu Religious
Assistant Commissioner - Commercial Tax officer
District Registrar
Divisional Officer in Fire and Rescue services Department
Assistant Conservator of Forest
District Employment Officer

the names of the Some good books for the TNPSC Group I Examination is given below

.History
i)Prof.J.Dharmarajan's Tamilnadu History
ii)K.Venkadesan. India Freedom Struggle

.Indian Polity
i)Lakshi Kanth - Indian Polity

Indian Economy
i)Pratiyogita Darban's Indian Economy & Ramesh Singh's Indian Economy Book

Geography
i)Oxford School Atlas
ii)Spectrum Publication -Indian Geography

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

.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