As you have asked about the Tamil Nadu public Service Commission (TNPSC) group 1 exam and its syllabus for the preliminary exam, I am giving you information about it, check below for the details

TNPSC group 1 exam is conducted for recruitment of following posts

Deputy Collector
Deputy Superintendent of Police (Category – I)
Assistant Commissioner (C.T.)
District Registrar

Eligibility Details:
Applicant should have degree or diploma in relevant field from a recognized University / Institute.

Age Limit:
Minimum 21 years

Examination Fee:

For Preliminary Examination: Rs.125/-
For Main Written Examination: Rs.125/-

Pay scale:

Appointed candidates will be provided a monthly remuneration of Rs.15600-39100/- + G.P Rs.5400/- (PB-3).

Selection Procedure:

Preliminary Exam
Main written Exam
Oral test in the form of an Interview

Syllabus Details:

GENERAL SCIENCE

GENERAL SCIENCE Will Cover General appreciation and understanding of Science including matters of everyday observations and experience as may be expected of a well educated person who has not made any special study of any scientific discipline. The questions shall be from topics- in Physics, Chemistry and Biology viz.,. Scientific Laws, Scientific instruments, Inventions and Discoveries. Scientists and their contributions. Human Physiology, Diseases, their cause, cure and prevention, Diet-Balanced diet, human Genetics, Animals, Mammals and Birds, Environment and Ecology. Elements and Compounds. Acids, Bases and Salts and allied Subjects, Motion, Newtons Laws of Motion - Properties of Matter, Electricity, National Laboratories and other related topics.
HISTORY OF INDIA

Dates and events relating to indus Valley Civilisation, Vedic, Aryan and Sangam Age, Maurya Dynasty, Buddhism and Jainism, Guptas and Vardhanas, Pallavas, Cholas and Pandias, Sultanate and Mughal Period. Advent of European powers specially the British and other related topics.
GEOGRAPHY OF INDIA

Earth, Motions of Earth, Rotation and Revolution and their effects, Structure of Earth, Natural regions of India, Weather, Monsoon and Climate. Rainfall, Natural Calamities, Indian Towns and Places, Hill Stations, National parks, Major Ports, Crops and Minerals, Location of Major Industries, Forests and Wildlife, Population distribution in India and other related topics.
ECONOMICS AND COMMERCE

Agriculture, Major crops and crop pattern in India, Industrial Development, Major medium, small scale and cottage Industries of Tamil Nadu. Village and Rural Development in India. Housing, Drinking water and other developmental schemes - price policy, Inflation, population and unemployment problems, imports and exports.
INDIAN POLITY

Indian Consitution, Salient features, citizenship, elections, Parliament and State Legistature, Executive set up of States, Judiciary system, Local self Governments, Centre - State Relations, Language Policy, Foreign policy.
INDIAN NATIONAL MOVEMENT

National freedom movement and attainment of independence - contribution of National Leaders like Bal Ganga Dhar Tilak, Gopalakrishna Gokhale, Dada Bhai Nauvroji Mahatma Gandhi, Jawaharlal Nehru and others - Role of Tamil Nadu in Freedom Movement, Bharathiyar, V.O.C, Subramaniya Siva, Rajaji and others.
CURRENT EVENTS

Latest development in Science and technology, political developments in India, New developments in Trade, Transport and communicaton, historical events. Fine arts like dance, drama, films, painting, major literary works Games and Sports, National, International awards, National and International organisations, Abbreviations, who is who, Books and Authors, General Terminology, India and its Neighbours, present day India and other related topics.
MENTAL ABILITY TESTS

These tests are meant to verify the candidate's capability to draw conclusions through, inductive or deductive reasoning from tables and charts. It will include elementary problems from school mathematics.