What is UPSC?

UPSC stands for Union Public Service Commission. It is India’s central recruiting body for many of the country’s most respected government jobs, especially Group A and some Group B posts. UPSC conducts exams for civil services, defense officer entry, engineering services, medical services, scientific services, and several other national-level recruitments.

UPSC major exams at a glance

Exam	Type	Stage pattern	Final output	Group	Nature of exam
Civil Services Examination (CSE)	Objective + Written + Interview	Prelims → Mains → Interview	IAS, IPS, IFS, IRS, and other central services	Group A	National
Indian Forest Service (IFS)	Objective + Written + Interview	Prelims → Mains → Interview	Forest officer service	Group A	National
Engineering Services Examination (ESE)	Objective + Written + Interview	Prelims → Mains → Interview	Engineering officer posts	Group A	National
Combined Defence Services (CDS)	Objective + Interview	Written → SSB	Army, Navy, Air Force officer entry	Group A officer entry	National
National Defence Academy (NDA) & Naval Academy (NA)	Objective + Interview	Written → SSB	Commissioned officer entry after training	Officer entry	National
CAPF Assistant Commandant	Objective + Written + Interview	Paper I → Paper II → Interview	Assistant Commandant in CAPFs	Group A	National
Combined Medical Services (CMS)	Objective + Interview	Written → Interview	Medical officer posts	Group A	National
Indian Economic Service / Indian Statistical Service (IES/ISS)	Written + Interview	Written → Interview	Economist / Statistician officer posts	Group A	National
Combined Geo-Scientist	Objective + Written + Interview	Prelims → Mains → Interview	Scientist / Geo-scientist posts	Group A	National

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Civil Services Examination (IAS, IPS, IFS, IRS, etc.)

Item	Details
What it is	UPSC’s top exam for India’s most prestigious administrative services
Type	Prelims: Objective; Mains: Written; Interview: Personality test
Number of stages	3
Posts you get	IAS, IPS, IFS, IRS, IRTS, IA&AS, and many other central services
Group	Mostly Group A
Salary	Usually starts at Level 10, basic pay around ₹56,100 plus allowances
Final marks	2025 marks total = Mains 1750 + Interview 275. Prelims is only qualifying
Selection strength	No fixed safe score; depends on category, year, vacancy, and paper difficulty

CSE syllabus

Paper	Subject	Main topics
Prelims Paper I	General Studies	Current affairs, history, polity, geography, economy, environment, science, government schemes, international events
Prelims Paper II	CSAT	Comprehension, reasoning, data interpretation, basic maths, decision-making
Mains Paper A	Indian language	Grammar, comprehension, translation, essay
Mains Paper B	English	Grammar, comprehension, translation, essay
Mains Paper I	Essay	Social, political, economic, ethical, and abstract themes
Mains Paper II	GS 1	History, culture, society, geography
Mains Paper III	GS 2	Polity, governance, constitution, international relations
Mains Paper IV	GS 3	Economy, agriculture, science & tech, environment, security, disaster management
Mains Paper V	GS 4	Ethics, integrity, aptitude, case studies
Mains Optional	Optional subject	Two papers from chosen optional subject

Question style

Area	Style
Prelims	Tricky MCQs, elimination based, concept + current affairs mix
CSAT	Qualifying but risky; comprehension-heavy
Mains	Analytical, structured, example-based, interlinked answers
Optional	Deep subject knowledge + answer writing

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Indian Forest Service (IFS)

Item	Details
What it is	Officer service focused on forest, environment, biodiversity, and conservation
Type	Same route as CSE: Prelims, Mains, Interview
Number of stages	3
Posts you get	Indian Forest Service officer
Group	Group A
Salary	Around Level 10, basic pay near ₹56,100 plus allowances
Final marks	Mains + Interview decide merit
Distinctive feature	Technical optional papers related to forest/subjects, depending on notification

Core syllabus difference from CSE

IFS uses the CSE prelims, then a separate mains with scientific and environment-focused papers. The questions are more technical than IAS-level general administration questions.

Engineering Services Examination (ESE)

Item	Details
What it is	UPSC exam for engineering officer posts in government departments
Type	Prelims: Objective; Mains: Conventional written; Interview
Number of stages	3
Posts you get	Civil, Mechanical, Electrical, Electronics & Telecommunication engineers in government services
Group	Group A
Salary	Usually starts around Level 10 or Level 11, depending on post and department
Final marks	Prelims qualifying, Mains + Interview decide final merit

ESE syllabus

Stage	Subject	Topics
Prelims Paper I	General Studies + Engineering Aptitude	Current affairs, engineering basics, ethics, environment, project management, reasoning
Prelims Paper II	Technical engineering	Civil / Mechanical / Electrical / E&T core concepts
Mains Paper I	Technical	Discipline-specific conventional problems
Mains Paper II	Technical	Advanced discipline-specific conventional problems

Question style

Engineering Services is not simple memory-based MCQ prep. It needs formula mastery, derivations, numerical solving, and engineering concepts.

Combined Defence Services (CDS)

Item	Details
What it is	UPSC exam for officer entry into Indian Army, Navy, and Air Force
Type	Objective written + SSB interview
Number of stages	2 major stages
Posts you get	Commissioned officer entry after training
Group	Officer entry
Salary	After commissioning, usually starts around Level 10, basic pay about ₹56,100 plus allowances
Final marks	Written + SSB

CDS syllabus

Paper	Subject	Topics
English	Objective	Grammar, vocabulary, comprehension, sentence correction, cloze test
General Knowledge	Objective	Current affairs, history, polity, geography, economy, science
Elementary Mathematics	Objective	Arithmetic, algebra, geometry, trigonometry, mensuration, statistics

Question style

CDS asks school-level to moderate-level objective questions. English and GK are often the deciding factors for many candidates.

National Defence Academy (NDA) and Naval Academy (NA)

Item	Details
What it is	UPSC exam for entry into NDA and Naval Academy
Type	Objective written + SSB interview
Number of stages	2 major stages
Posts you get	Cadet entry into Army, Navy, Air Force, Naval Academy
Group	Officer entry
Salary	During training, cadets get stipend; after commissioning, officer pay begins
Final marks	Written + SSB

NDA syllabus

Paper	Subject	Topics
Mathematics	Objective	Algebra, trigonometry, calculus basics, coordinate geometry, statistics, probability, matrices
GAT	Objective	English, current affairs, history, geography, physics, chemistry, biology, general science

Question style

NDA is based on 10+2 level concepts, but the competition is high. Speed matters a lot.

CAPF Assistant Commandant

Item	Details
What it is	UPSC exam for Assistant Commandant in paramilitary forces
Type	Objective + written + interview
Number of stages	3
Posts you get	Assistant Commandant in BSF, CRPF, CISF, ITBP, SSB
Group	Group A
Salary	Usually around Level 10, basic pay near ₹56,100
Final marks	Paper I + Paper II + Interview

CAPF syllabus

Paper	Subject	Topics
Paper I	General Ability and Intelligence	Reasoning, quant, English, general science, current affairs
Paper II	General Studies, Essay, Comprehension	Polity, history, geography, economy, essay writing, précis, comprehension

Question style

Paper I is objective and speed-based. Paper II tests structured writing and clarity.

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Combined Medical Services (CMS)

Item	Details
What it is	UPSC exam for medical officer posts
Type	Objective written + interview
Number of stages	2
Posts you get	Medical Officer in central government services
Group	Group A
Salary	Usually around Level 10, basic pay near ₹56,100
Final marks	Written + interview

CMS syllabus

Paper	Subject	Topics
Paper I	General Medicine	Diagnosis, clinical conditions, treatment basics
Paper I	Pediatrics	Child health, neonatology, diseases, immunization
Paper II	Surgery	Surgical principles, trauma, operative concepts
Paper II	Gynecology & Obstetrics	Pregnancy, childbirth, women’s health

Question style

CMS is subject-heavy and clinical. It tests MBBS-level understanding, not general aptitude.

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Indian Economic Service (IES) and Indian Statistical Service (ISS)

Item	Details
What it is	UPSC exam for economist and statistician officer posts
Type	Written + interview
Number of stages	2
Posts you get	Economic Service Officer / Statistical Service Officer
Group	Group A
Salary	Usually around Level 10, basic pay near ₹56,100
Final marks	Written + interview

IES/ISS syllabus

Service	Subjects	Main topics
IES	Economics papers	Microeconomics, macroeconomics, public finance, monetary economics, international trade, growth, development
ISS	Statistics papers	Probability, sampling, estimation, regression, inference, time series, numerical methods
Both	General English	Essay, précis, grammar, comprehension

Question style

IES/ISS is technical and theory-heavy. It requires economics or statistics depth, not just current affairs.

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Combined Geo-Scientist

Item	Details
What it is	UPSC exam for scientific officer posts in geology, geophysics, chemistry, and hydrology-related areas
Type	Objective + written + interview
Number of stages	3
Posts you get	Scientist / Geo-scientist / geophysical officer posts
Group	Group A
Salary	Usually around Level 10, basic pay near ₹56,100
Final marks	Prelims + Mains + Interview

Geo-Scientist syllabus

Stage	Subject	Topics
Prelims	General Studies	Current affairs, geography, environment, science
Prelims	Subject paper	Geology / Geophysics / Chemistry / Hydrogeology
Mains	Subject paper	Deep technical descriptive papers

Question style

This exam is highly specialized and science-technical in nature.

UPSC official websites and resources

Purpose	Website
Official UPSC website	https://upsc.gov.in
Active exams / notifications	https://upsc.gov.in/examinations/active-exams
Previous question papers section	UPSC website under examinations / previous question papers
Answer keys / notices	UPSC website under examination notices and answer key pages
Current updates	UPSC official site, PIB, and UPSC exam notices