Yes, candidates have to clear all the phases of UPSC –IAS exam to become Indian Administrative Service (IAS) officer.

IAS Exam:
Eligibility Criteria :

Nationality:
A citizen of India,
or a subject of Nepal,
or a subject of Bhutan,
or a Tibetan refugee

Academic Eligibility
Must hold a PASS BACHELOR'S degree in any stream .

Age limits
21 years -32 years

Relaxation in age limit as per Govt. norms .


IAS 2016 Exam Dates:-

CIVIL SERVICES (PRELIMINARY) EXAM. 2016:-
07.08.2016 (SUNDAY).

CIVIL SERVICES (MAIN) EXAM, 2016:-
03.12.2016 (SATURDAY)

DURATION OF EXAM:-
5 DAYS

CIVIL SERVICES EXAM 2017 DATE:-

CIVIL SERVICES (PRELIMINARY) EXAM. 2017

DATE OF NOTIFICATION (WEDNESDAY)- 22.02.2017

LAST DATE FOR RECEIPT OF APPLICATIONS –
17.03.2017 (FRIDAY)

DATE OF COMMENCEMENT OF EXAM - 18.06.2017 (SUNDAY)

DURATION OF EXAM - 1 DAY

CIVIL SERVICES (MAIN) EXAM, 2017

DATE OF COMMENCEMENT OF EXAM –
28.10.2017 (SATURDAY)

DURATION OF EXAM - 5 DAYS

IAS Preliminary Exam Pattern:-

Two compulsory papers of 200 marks each.

Both the question papers will be of the objective type (multiple choice questions).

The question papers will be set both in Hindi and English.

Each paper will be of two hours duration.

IAS Main Examination Pattern:-

Consist following papers :-

Paper-A
One of the Indian Language to be selected by the candidate from the Languages included in the Eighth Schedule of the Constitution
- 300 Marks

Paper-B English - 300 Marks

Paper-I Essay - 250 Marks

Paper-II General Studies-I - 250 Marks (Indian Heritage and Culture, History and Geography of the World and Society)

Paper-III General Studies -II - 250 Marks (Governance, Constitution, Polity, Social Justice and International relations)

Paper-IV General Studies -III - 250 Marks (Technology, Economic Development, Bio-diversity, Environment, Security and Disaster Management)

Paper-V General Studies -IV - 250 Marks (Ethics, Integrity and Aptitude)

Paper-VI Optional Subject - Paper 1 - 250 Marks

Paper-VII Optional Subject - Paper 2 - 250 Marks

Sub Total (Written test) - 1750 Marks

Personality Test - 275 Marks

Grand Total - 2025 Marks

Optional subjects:-

(i) Agriculture
(ii) Animal Husbandry and Veterinary Science
(iii) Anthropology
(iv) Botany
(v) Chemistry
(vi) Civil Engineering
(vii) Commerce and Accountancy
(viii) Economics
(ix) Electrical Engineering
(x) Geography
(xi) Geology
(xii) History
(xiii) Law
(xiv) Management
(xv) Mathematics
(xvi) Mechanical Engineering
(xvii) Medical Science
(xviii) Philosophy
(xix) Physics
(xx) Political Science and International Relations
(xxi) Psychology
(xxii) Public Administration
(xxiii) Sociology
(xxiv) Statistics
(xxv) Zoology
(xxv) Literature of any one of the following languages: