UPSC ESE/IES Exam Pattern 2026: Prelims, Mains and Personality Test — Complete Breakdown

The UPSC Engineering Services Examination (ESE), still widely known as IES, is the gateway to Group A engineering positions in the Government of India. Unlike GATE — which is primarily an entrance test for MTech and PSU recruitment — ESE is a full-fledged UPSC examination that leads to direct Class I officer postings in organisations like Indian Railways, CPWD, CWC, MES, BIS, and several technical ministries. Here's the complete exam structure with enough detail to actually plan your preparation.

ESE at a Glance

Parameter	Details
Conducting body	UPSC (Union Public Service Commission)
Post	Group A (Class I) Engineering Officer
Total marks	1,300 (Prelims 500 + Mains 600 + Interview 200)
Branches	Civil, Mechanical, Electrical, Electronics & Telecom
Approximate vacancies (annual)	200-350
Eligibility	Engineering degree (BTech/BE/BSc Engg) from recognised university
Age limit	21-30 years (relaxation for reserved categories)
Exam frequency	Once a year
Negative marking	Yes (Prelims: 1/3rd of marks for wrong answer)

Stage 1 — Preliminary Examination

Total: 500 marks | Two papers | Objective (MCQ)

The Prelims is a screening stage — marks are used only for shortlisting to Mains and are not counted in the final merit.

Paper	Subject	Marks	Duration	Questions
Paper I	General Studies and Engineering Aptitude	200	2 hours	100-120 MCQs
Paper II	Engineering Discipline (branch-specific)	300	3 hours	100-120 MCQs

Negative marking: 1/3rd of allotted marks for each wrong answer.

Paper I — General Studies and Engineering Aptitude (200 marks)

This paper is common across all four branches. It tests a broad range of topics:

• Current affairs: National and international events of engineering/scientific significance
• Engineering aptitude: Basic engineering concepts, problem-solving, engineering drawing, standards and quality practices
• Engineering mathematics: Linear algebra, calculus, differential equations, probability and statistics, numerical methods
• General principles of design and drawing: Engineering drawing conventions, machine drawing basics
• Standards and quality practices: BIS standards, ISO 9000, total quality management concepts
• Ethics and values: Professional ethics, engineering ethics, environmental ethics
• IT and computers: Basics of computer hardware, software, networking, cybersecurity awareness, emerging technologies (AI, IoT)
• Environmental science: Pollution types, environmental legislation, EIA, sustainable development
• Project management: PERT/CPM, project planning fundamentals

Paper II — Engineering Discipline (300 marks)

This paper is specific to your chosen branch. The syllabus covers core subjects from your BTech curriculum.

Branch-wise key subjects:

Branch	Core Subjects
Civil Engineering	Structural Engineering, Geotechnical Engineering, Water Resources, Environmental Engineering, Transportation, Surveying, Building Materials
Mechanical Engineering	Thermodynamics, Fluid Mechanics, Manufacturing, Strength of Materials, Machine Design, Industrial Engineering, Theory of Machines
Electrical Engineering	Circuit Theory, Electrical Machines, Power Systems, Control Systems, Electrical Measurements, Power Electronics, Analog/Digital Electronics
Electronics & Telecom	Network Theory, Electronic Devices, Analog/Digital Circuits, Signal Processing, Communication Systems, Electromagnetic Theory, Microprocessors

Stage 2 — Main Examination

Total: 600 marks | Two papers | Conventional (descriptive/numerical)

Mains is where ESE separates serious candidates from the rest. These are conventional papers — you solve engineering problems step by step on paper, not MCQs.

Paper	Subject	Marks	Duration
Paper I	Engineering Discipline (Part A)	300	3 hours
Paper II	Engineering Discipline (Part B)	300	3 hours

Both papers are from your chosen engineering branch. The syllabus is the same as Prelims Paper II but the depth is significantly greater — you need to derive, calculate, design, and explain. Key differences from Prelims:

• Descriptive format — show complete working, derivations, and diagrams
• Numerical problems — expect lengthy calculations involving design, analysis, and problem-solving
• No negative marking — attempt every question, even partial answers get marks
• Quality over speed — neat presentation, clear diagrams, and structured answers score better

Mains marking scheme: Each paper typically has 8 questions, of which you attempt 5. Each question carries 60 marks and may have sub-parts (a, b, c).

Stage 3 — Personality Test (Interview)

Total: 200 marks

Candidates shortlisted from Mains appear for the Personality Test conducted by a UPSC interview board.

Aspect	Details
Marks	200
Duration	30-45 minutes
Panel	UPSC board members (senior engineers, bureaucrats, academics)
Focus areas	Technical knowledge, current engineering developments, communication, leadership, decision-making

The interview tests not just technical knowledge but your understanding of the role of an engineering officer in government — infrastructure development, project management, public service orientation.

Final Merit Calculation

Component	Marks
Mains Paper I	300
Mains Paper II	300
Personality Test	200
Total	800

Prelims marks are NOT counted. The final merit list is based on Mains + Interview only.

Minimum Qualifying Marks

UPSC declares separate cut-offs for each stage. Historically:

Stage	General	OBC	SC	ST
Prelims (out of 500)	230-280	210-260	190-230	180-220
Mains (out of 600)	280-340	250-310	220-280	200-260
Interview (out of 200)	Minimum qualifying — typically 50+	40+	35+	35+

Note: These are approximate ranges based on recent years. Actual cut-offs vary significantly based on vacancy count, difficulty level, and number of applicants.

Branch-Wise Vacancy Trends

Not all branches have equal opportunities. Here's the typical vacancy distribution:

Branch	Typical Vacancy Share	Major Recruiting Departments
Civil Engineering	35-40% (highest)	CPWD, CWC, BRO, MES, Railways, CGWB
Mechanical Engineering	25-30%	Railways, MES, DGQA, Naval Dockyard, DGAQA
Electrical Engineering	15-20%	Railways, CWC, MES, CEA
Electronics & Telecom	10-15% (lowest)	Indian Railways (Signal), DoT, MES, Wireless Planning Commission

Civil Engineering consistently has the most seats, making it statistically easier to secure a rank. Electronics & Telecom has the fewest seats and tends to be the most competitive per vacancy.

ESE vs GATE — Which Should You Prioritise?

Parameter	UPSC ESE	GATE
Nature	Full recruitment exam (Prelims + Mains + Interview)	Aptitude test (MCQ only)
Outcome	Direct Group A officer posting	MTech admission + PSU shortlisting
Difficulty level	Very high (descriptive Mains, interview)	High (but MCQ only)
Vacancies	200-350/year	PSU recruitment varies widely
Starting post	Group A (Class I Officer)	PSU executive trainee (varies)
Salary at entry	Level 10 — Rs 56,100 basic (~Rs 1,08,000 gross in metros)	PSU-dependent — Rs 40,000-60,000 (E1/E2 grade)
Career trajectory	Can reach Chief Engineer, Member (Railway Board), Secretary level	PSU management track
Preparation overlap	60-70% syllabus overlap in technical subjects	Primarily technical subjects
Study duration	12-18 months (dedicated)	6-12 months

The smart approach: Prepare for both simultaneously. The technical syllabus has 60-70% overlap. Use GATE preparation as your base for ESE Prelims Paper II, then add GS preparation for ESE Paper I and conventional problem-solving practice for ESE Mains.

ESE Officer Salary (Pay Level 10)

Component	Monthly Amount (Approx.)
Basic Pay	Rs 56,100
DA (46%)	Rs 25,806
HRA (27% — X cities)	Rs 15,147
Transport Allowance	Rs 7,200
Gross Salary	Rs 1,04,000-1,10,000
In-hand (after deductions)	Rs 85,000-95,000

Additional benefits include government accommodation (or HRA), medical facilities, LTC, children's education allowance, and pension under NPS. The career trajectory can take you to Level 14+ (Joint Secretary equivalent) with gross salary exceeding Rs 2,50,000.

Preparation Strategy for ESE 2026

1. Start with GATE-level preparation — Build your technical foundation using GATE standard textbooks
2. Add GS component early — Paper I (General Studies) requires consistent reading of current affairs and basic engineering aptitude
3. Practice conventional problems — This is the key differentiator. Solving numerical problems step-by-step on paper is a skill that needs dedicated practice
4. Previous year papers — UPSC ESE previous year papers (last 10-15 years) are essential. The pattern of questions repeats in terms of topics and difficulty
5. Time management — Prelims is time-pressured (MCQs), Mains rewards depth and accuracy over speed
6. Interview preparation — Start reading about the departments you might be allocated to (CPWD projects, railway electrification, CWC water management, etc.)

---

Frequently Asked Questions

Can I appear for ESE with a BSc (Engineering) or AMIE degree? Yes. Any engineering degree recognised by the government — BTech, BE, BSc (Engineering), AMIE — is eligible. The branch must match one of the four ESE branches (Civil, Mechanical, Electrical, Electronics & Telecom). Is there any service allocation like UPSC Civil Services? Yes. After the final merit list, candidates are allocated to various departments (Railways, CPWD, MES, CWC, etc.) based on rank, preference, and vacancy. Higher-ranked candidates get better choices. Can I switch branches after joining ESE? No. You are recruited for a specific branch and department. Switching branches is not possible, though inter-departmental transfers may happen after several years of service. How many attempts are allowed for UPSC ESE? There is no limit on the number of attempts for General and OBC candidates, as long as you are within the age limit (30 years for General, 33 for OBC). SC/ST candidates have no upper age limit.

---

Related Articles

• UPSC Civil Services Complete Guide
• PSU Recruitment Through GATE
• Government Jobs for Engineers
• ISRO Scientist Exam Pattern
• Highest Paying Government Jobs