UPSC ESE Exam Pattern 2027: Prelims, Mains and Interview

The UPSC ESE exam pattern 2027 has three stages: an objective Preliminary Examination, a conventional (written) Main Examination and a Personality Test. The Union Public Service Commission (UPSC) adds the marks of all three stages, out of 1,300, to prepare the final merit list for Group A and Group B engineering posts in Civil, Mechanical, Electrical, and Electronics and Telecommunication Engineering.

The ESE 2027 notification, issued on 16 September 2026, keeps the same structure as recent years. The Prelims are on 31 January 2027 and the Mains on 18 June 2027. This page explains each paper, the marking scheme, the minimum qualifying marks, the rules for answer writing and how your final rank is calculated, so you can plan your time around where the marks actually are.

Table of Contents

• UPSC ESE Exam Pattern 2027 at a Glance

• Key Points to Know for 2027

• Stage 1: Preliminary Examination Pattern

• Marking Scheme and Negative Marking

• Minimum Qualifying Marks and Shortlisting

• Stage 2: Main Examination Pattern

• Rules for Conventional Papers

• Stage 3: Personality Test

• How the Final Merit Is Calculated

• What the Pattern Means for Your Preparation

• Time Management and Exam-Day Strategy

UPSC ESE Exam Pattern 2027 at a Glance

Your engineering discipline is fixed at the application stage. You can apply in only one of the four categories, and every technical paper you write, in Prelims and Mains, is set in that discipline.

Key Points to Know for 2027

• No change in structure: The papers, marks and durations in the ESE 2027 notification match the pattern UPSC has followed since it moved to the three-stage format in 2017.

• Prelims marks are not just for screening: The 500 Prelims marks of qualified candidates are added to the final total, unlike exams where the first stage only filters candidates.

• Negative marking applies only to Prelims: One-third of a question's marks is deducted for a wrong answer in the objective papers. The conventional Mains papers carry no such penalty.

• English only: Question papers are set in English, and the conventional papers must be answered in English.

• Calculators only in Mains: Battery-operated pocket calculators are allowed in the conventional papers but not in the objective Prelims papers.

• Each paper has a floor: UPSC has applied a minimum score in every paper, not just an overall cut-off, in recent cycles. The details are below.

Stage 1: Preliminary Examination Pattern

The Preliminary Examination is a pen-and-paper test with two objective papers on the same day. Recent question papers have had 100 questions in Paper I and 150 in Paper II, each worth 2 marks.

In recent cycles, Paper I was held in the morning session (9:30 AM to 11:30 AM) and Paper II in the afternoon (2:00 PM to 5:00 PM). Check the exact timings on your e-admit card, which UPSC issues on the last working day of the week before the exam.

Paper I: General Studies and Engineering Aptitude

This paper is the same for all four disciplines and is set at the level expected of an engineering or science graduate. UPSC sets questions from all ten topics below, and each topic can carry 5% to 15% of the paper's marks.

• Current issues: National and international developments in social, economic and industrial areas.

• Engineering Aptitude: Logical reasoning and analytical ability.

• Engineering Mathematics and Numerical Analysis.

• Design and safety: General principles of design, drawing and the importance of safety.

• Standards and quality practices: In production, construction, maintenance and services.

• Energy and environment: Conservation, pollution, climate change and environmental impact assessment.

• Project management, material science, ICT tools, and ethics and values in the engineering profession.

Paper II: Engineering Discipline

Paper II covers the full technical syllabus of your discipline, which is the same syllabus used for both Mains papers. The difference is the format: Prelims tests it through quick objective questions, while Mains tests the same topics through derivations, numericals and design problems.

Marking Scheme and Negative Marking

Each Prelims question has four options. The notification sets out the penalty rules clearly.

Answers are marked on an OMR sheet with a black ball pen only. Pencils and ink pens are not allowed, and mistakes in filling the roll number or test booklet series can make the answer sheet liable for rejection.

Minimum Qualifying Marks and Shortlisting

The notification gives the Commission discretion to fix minimum qualifying marks in any or all papers. UPSC's published cut-off documents for ESE 2023, 2024 and 2025 show how this has been applied.

These floors only make you eligible to be counted. The real filter is the category-wise cut-off on the total. For the Prelims, that cut-off is out of 500. For the call to the Personality Test, UPSC uses the combined written score out of 1,100 (Prelims plus Mains).

• Prelims to Mains: About six to seven times the number of vacancies are admitted to the Main Examination.

• Mains to Personality Test: About twice the number of vacancies are called for the interview.

The per-paper percentages come from UPSC's cut-off documents of recent years, not from the notification itself, so treat them as the recent practice rather than a fixed rule.

Stage 2: Main Examination Pattern

Only candidates declared qualified in the Prelims can take the Mains. Both papers are conventional and discipline-specific.

The discipline syllabus is printed in two parts, Paper I and Paper II. In Civil Engineering, for example, Paper I covers building materials, solid mechanics, structural analysis, steel and concrete design, and construction management. Paper II covers fluid mechanics, hydrology, environmental, geotechnical, surveying and transportation engineering.

How Prelims Paper II and Mains Overlap

Because the same technical syllabus feeds three papers, one round of concept study serves both stages. What changes is how you practise.

Rules for Conventional Papers

Mains answers are marked by examiners, so presentation and method matter as much as the final number. The notification lists several rules that directly affect your score.

• Write in English, in your own hand: Scribes are allowed only for eligible Persons with Benchmark Disabilities as per the notification.

• Illegible handwriting costs marks: Up to 5% of the maximum marks for the written papers can be deducted for illegible handwriting.

• No marks for superficial knowledge: Credit is given for orderly, effective and exact expression with due economy of words.

• SI units throughout: Questions use SI units, and standard tables or charts in SI units are supplied where necessary.

• Use international numerals: Write numbers in the international form of Indian numerals (1, 2, 3 and so on).

• No identifying marks: Any irrelevant matter or sign that could reveal your identity can lead to a deduction or the script not being evaluated.

Stage 3: Personality Test

The Personality Test carries 200 marks and has no minimum qualifying marks. The board assesses leadership, initiative, intellectual curiosity, tact and other social qualities, mental and physical energy, practical application and integrity of character.

There is no syllabus for the interview. Expect questions on your engineering background, projects, work experience if any, your service preferences and current issues linked to infrastructure, energy, railways, defence or telecom. Original documents are checked at this stage, and candidates who applied before completing their degree must have uploaded proof of passing within the window UPSC allows after the Mains result.

How the Final Merit Is Calculated

Your final rank is based on the total of all three stages. Services are then allotted by rank, your preference order and the vacancies available, subject to medical fitness.

Worked example: Suppose you score 250 in Prelims, 330 in Mains and 130 in the Personality Test. Your written score is 580 out of 1,100, and your final total is 710 out of 1,300. A candidate with a lower Prelims score of 230 but 340 in Mains and 150 in the interview finishes on 720 and ranks above you. The interview alone can move a total by 20 or more marks, so a safe written score matters.

Marks are rounded off to two decimal places at every stage. If two candidates tie on the final total, UPSC applies these rules in order:

1. Technical papers plus interview: More marks in the three engineering papers (Prelims Paper II and both Mains papers) plus the Personality Test ranks higher.

2. Technical papers only: If still equal, more marks in the three engineering papers ranks higher.

3. Age: If still equal, the older candidate ranks higher. Any remaining tie is resolved at the Commission's discretion.

What the Pattern Means for Your Preparation

• Technical subjects carry about 69% of the total: Prelims Paper II and the two Mains papers add up to 900 of 1,300 marks. Your discipline subjects deserve most of your study hours.

• General Studies is a rank booster, not a filler: Paper I carries the same 200 marks as the interview. Topics such as engineering mathematics, material science and project management overlap with your degree and reward steady revision.

• Three wrong answers cancel one right answer: Each wrong answer costs about 0.67 marks against a gain of 2. Attempt a question when you can eliminate at least two options with confidence.

• Both papers have the same speed demand: You get 72 seconds per question in Paper I (100 questions in 120 minutes) and in Paper II (150 questions in 180 minutes). Practise at that pace.

• The gap between stages is short: With about four and a half months between Prelims and Mains in 2027, prepare for conventional writing alongside objective practice, not after the Prelims result.

Time Management and Exam-Day Strategy

For the Prelims

• Use a two-pass approach: Answer the questions you are sure of first, mark the doubtful ones, and return to them in the last 25 to 30 minutes.

• Fill the OMR as you go: Transfer answers in blocks rather than leaving all bubbling to the end.

• Plan without a calculator: Since calculators are not allowed in the objective papers, practise approximation and quick arithmetic for numerical questions.

For the Mains

• Read the whole paper first: Pick the questions where you can show complete working, and budget time by marks.

• Write method, then result: State assumptions, draw a labelled sketch, show steps and box the final answer with units.

• Keep the presentation clean: Given the handwriting deduction, a readable, well-spaced script is worth practising in every mock.

On exam day

Entry to the venue closes 30 minutes before each session, and every candidate goes through face authentication. Carry your e-admit card and the photo ID whose details you gave in the application. Mobile phones, smart watches and other electronic devices are banned, even if switched off.