UPSC & Central Govt · Updated October 2026
UPSC ISS ExamEligibility, Syllabus, Exam Pattern, Salary, Cut-Off, PYQs and Free Mock Test
UPSC Indian Statistical Service (ISS)
The Indian Statistical Service (ISS) Examination is conducted by UPSC to recruit officers for the Indian Statistical Service, a Group A service that handles statistical work in central ministries and departments. The examination has six written papers, two of which are objective, followed by a viva voce.
- Type
- Recruitment
- Level
- National
- Conducting body
- UPSC
Start for free with UPSC ISS syllabus study notes, solved previous year papers, real-pattern mock tests and AI Tutor support.
UPSC ISS exam overview and highlights
About UPSC ISS
The Indian Statistical Service (ISS) Examination is conducted by UPSC to recruit officers for the Indian Statistical Service, a Group A service that handles statistical work in central ministries and departments. The examination has six written papers, two of which are objective, followed by a viva voce. It is held alongside the Indian Economic Service examination.
The examination process for UPSC ISS comprises 2 stages: Written examination, followed by Viva voce (Interview). The official syllabus tests candidates across 5 core areas — Statistics I (Probability and Inference), Statistics II (Linear models and Official statistics), Statistics III (Sampling and Design), Statistics IV (Optional areas), General Studies and General English — focusing on conceptual clarity, speed, and accuracy. Final merit is the written examination (1000 marks across six papers, two objective and four descriptive) plus the viva voce (200 marks), followed by document verification and medical examination.
Key subjects
- Statistics I (Probability and Inference)
- Statistics II (Linear models and Official statistics)
- Statistics III (Sampling and Design)
- Statistics IV (Optional areas)
- General Studies and General English
What clearing UPSC ISS leads to
- Indian Statistical Service (ISS) officer, Group A, usually joining as Assistant Director
- Compensation & Pay Scale: Pay Level 10 (basic pay around ₹56,100) plus allowances
- Central / Institutional appointment through Union Public Service Commission (UPSC) merit recommendation
- Structured time-scale promotions, Departmental Promotion Committee (DPC) elevation, and central allowances (DA, HRA, TA, Medical & NPS)
- All-India or zonal ministry, department, PSU, or public sector field and headquarters postings
- Deputation opportunities to central autonomous bodies, ministries, regulatory authorities, and international assignments
Quick facts
- Full name
- UPSC Indian Statistical Service (ISS)
- Conducting body
- Union Public Service Commission (UPSC)
- Frequency
- Once a year, usually held together with the Indian Economic Service examination
- Exam mode
- Offline (OMR sheet for Statistics I and II, descriptive for the rest)
- Languages
- English only
- Stages & papers
- 2 stages (6 papers total)
- Negative marking
- One-third of the marks of a question deducted per wrong answer in the objective Statistics I and II papers
- Official website
- upsc.gov.in
UPSC ISS — Key Highlights & Official Particulars
Complete snapshot of UPSC ISS conducting authority, frequency, mode, stages, negative marking and official portal.
| Particulars | Details |
|---|---|
| Exam Name | UPSC ISS — UPSC Indian Statistical Service (ISS) |
| Conducting Body | Union Public Service Commission (UPSC) |
| Exam Category | UPSC & Central Govt |
| Exam Level | National level |
| Exam Type & Purpose | Recruitment (Direct Recruitment & Cadre Selection) |
| Exam Frequency | Once a year, usually held together with the Indian Economic Service examination |
| Usual Notification & Exam Window | Notification in April; written examination in June; viva voce later in the year |
| Mode of Application | Online on upsc.gov.in through the One Time Registration (OTR) portal |
| Mode of Examination | Offline (OMR sheet for Statistics I and II, descriptive for the rest) |
| Medium / Exam Languages | English only |
| Selection Stages | 2 Stages (6 Papers Total): Written examination → Viva voce (Interview) |
| Negative Marking | One-third of the marks of a question deducted per wrong answer in the objective Statistics I and II papers |
| Selection / Merit Process | Final merit is the written examination (1000 marks across six papers, two objective and four descriptive) plus the viva voce (200 marks), followed by document verification and medical examination. |
| Educational Qualification | Bachelor's degree with Statistics, Mathematical Statistics or Applied Statistics as a subject, or a master's degree in Statistics, Mathematical Statistics or Applied Statistics |
| Age Limit | 21 to 30 years on 1 August of the exam year for the general category, with the usual relaxations |
| Pay Scale / Salary Structure | Pay Level 10 (basic pay around ₹56,100) plus allowances |
| Merit Panel Validity | Valid for the notified recruitment cycle and reserve list period |
| Competition Scale | A few thousand candidates for a small number of posts, usually in the tens |
| Official Website | upsc.gov.in |
Summary for orientation only, last reviewed October 2026. Check eligibility, dates and pattern in the official notification.
UPSC ISS exam schedule, vacancy, fee and online application process
Standard annual cycle and application workflow for UPSC ISS. Confirm exact notification and closing dates on the official UPSC website.
| Examination Event | Typical Calendar Window | Cycle / Mode |
|---|---|---|
| UPSC ISS Official Notification & Information Bulletin | Notification in April; written examination in June; viva voce later in the year | Once a year, usually held together with the Indian Economic Service examination |
| Online Registration & Application Fee Window | Typically remains open for 21 to 30 days from the date of notification release | Online Portal |
| Application Form Correction / Edit Window | 2 to 5 days immediately following the close of the online registration window | As Notified |
| Exam City Intimation & Admit Card Release | City slip 10–15 days prior; Hall Ticket / E-Admit Card 4 to 10 days before the exam date | Via Union Public Service Commission (UPSC) |
| UPSC ISS — Written examination | Notification in April; written examination in June; viva voce later in the year | Offline (OMR sheet for Statistics I and II, descriptive for the rest) |
| UPSC ISS — Viva voce (Interview) | Typically 6 to 12 weeks after declaration of Stage 1 results | Shortlisted Candidates |
| Provisional Answer Key & Objection Representation Window | Within 3 to 10 days after completion of the objective examination shifts | Online Challenge |
| Final Answer Key, Normalized Result & Merit List / Scorecard | Typically 3 to 6 weeks after conclusion of the examination stage | Merit List PDF / Login |
- Vacancies & Competition
- A few thousand candidates for a small number of posts, usually in the tens. Exact post-wise, department-wise, and category-wise (UR, EWS, OBC, SC, ST, ESM, PwBD) vacancies are notified in the official UPSC ISS recruitment advertisement published by Union Public Service Commission (UPSC).
- Application Fee & Payment Norms
- Standard UPSC examination fee norms apply (typically ₹100 to ₹200 for General/OBC/EWS male candidates; Female, SC, ST, and PwBD candidates are fully exempted from payment of the application fee).
How to apply online for UPSC ISS
One-Time Registration (OTR) & Portal Login
Visit upsc.gov.in and complete your candidate registration using a valid email ID, active mobile number, and Aadhaar / government photo ID details. Online on upsc.gov.in through the One Time Registration (OTR) portal.
Fill Academic, Personal & Exam Centre Preferences
Log in to open the UPSC ISS application form. Enter your qualifying degree/board details, category/reservation status, medium of examination (English only), and choose 3 to 4 preferred test cities.
Upload Photograph, Signature & Category Certificates
Upload a recent passport-size photograph (in prescribed KB dimensions and light background), scanned running-hand signature, and valid SC/ST/OBC-NCL/EWS/PwBD/Domicile certificates where applicable.
Online Application Fee Payment & Confirmation Page
Pay the category-wise examination fee via UPI, Net Banking, Debit/Credit Card, or e-Challan before the closing deadline, then download and preserve the final UPSC ISS Confirmation Page / Application PDF for admit card and verification stages.
UPSC ISS eligibility criteria and age relaxation
Candidates applying for UPSC ISS must fulfil the academic qualification, age limit, nationality and category reservation rules notified by UPSC.
Educational qualification
Bachelor's degree with Statistics, Mathematical Statistics or Applied Statistics as a subject, or a master's degree in Statistics, Mathematical Statistics or Applied Statistics.
Age limit & relaxations
21 to 30 years on 1 August of the exam year for the general category, with the usual relaxations.
Number of attempts
Unlimited attempts permitted as long as the candidate remains within the eligible category-wise upper age limit as on the crucial cut-off date.
Nationality & domicile
Indian citizen, with certain exceptions.
Other conditions & standards
Candidates must satisfy the prescribed medical fitness, character verification, and document authenticity norms (including valid EWS/OBC-NCL/SC/ST/PwBD certificates in the prescribed format) at the time of verification.
UPSC ISS — Category-Wise Upper Age Relaxation & Reservation Norms
| Category | Age Relaxation / Rule | Key Conditions & Documentation |
|---|---|---|
| Scheduled Caste (SC) / Scheduled Tribe (ST) (Central Government Norms) | +5 Years above prescribed upper age limit | Requires valid SC/ST certificate in the prescribed Government of India format. |
| Other Backward Classes — Non-Creamy Layer (OBC-NCL) (Central Government Norms) | +3 Years above prescribed upper age limit | Candidate must fall outside the Creamy Layer as on the crucial closing date of the online application. |
| Persons with Benchmark Disabilities (PwBD — UR / OBC / SC-ST) | +10 Years (UR) / +13 Years (OBC) / +15 Years (SC/ST) | Subject to post suitability and 40%+ benchmark disability certificate under the RPwD Act, 2016. |
| Ex-Servicemen (ESM) & Commissioned Officers (ECO / SSCO) | +3 to 5 Years after deducting military service rendered from actual age | Must produce discharge book / NOC from the competent defence authority at document verification. |
UPSC ISS selection process and exam pattern
Negative Marking & Evaluation Rule: One-third of the marks of a question deducted per wrong answer in the objective Statistics I and II papers. Selection & Merit Weightage: Final merit is the written examination (1000 marks across six papers, two objective and four descriptive) plus the viva voce (200 marks), followed by document verification and medical examination.
Stage 1: Written examination
Offline • 6 Papers (General English, General Studies, Statistics I + 3 more) • 1000 Total Marks • Duration: 3 hours • Six papers totalling 1000 marks: two general papers, two objective statistics papers and two descriptive statistics papers.
Six papers totalling 1000 marks: two general papers, two objective statistics papers and two descriptive statistics papers.
Paper / Section Questions Marks Duration General EnglishDescriptive Varies 100 3 hours General StudiesDescriptive Varies 100 3 hours Statistics IObjective 80 200 2 hours Statistics IIObjective 80 200 2 hours Statistics IIIDescriptive Varies 200 3 hours Statistics IVDescriptive Varies 200 3 hours Stage 2: Viva voce (Interview)
In person • An interview of 200 marks.
An interview of 200 marks. The final merit is prepared on 1200 marks.
Stage 3: Document Verification, Medical Fitness & Final Cadre/Post Allotment
In-person verification by Union Public Service Commission (UPSC) • Original academic, age, category & domicile certificates • Medical fitness examination & final merit allocation
Candidates shortlisted in the final merit list undergo thorough verification of original educational, age, category and domicile certificates followed by a prescribed medical fitness examination before appointment letters and cadre/department allotments are issued.
UPSC ISS subject-wise syllabus and study material
SmartRank organizes chapter-wise study notes for every subject below in 12 languages, with an AI Tutor on hand for doubts. Start exploring for free, and unlock the complete syllabus with Learn or SmartRank Pass.
Statistics I (Probability and Inference) — Part I (Probability theory and random variables)
- Probability theory and random variables
- Standard distributions
- Limit theorems
Statistics I (Probability and Inference) — Part II (Point and interval estimation)
- Point and interval estimation
- Testing of hypotheses
- Non-parametric methods
Statistics II (Linear models and Official statistics) — Part I (Linear models and regression)
- Linear models and regression
- Analysis of variance
- Multivariate analysis
Statistics II (Linear models and Official statistics) — Part II (Official statistics and the Indian)
- Official statistics and the Indian statistical system
- National accounts and index numbers
Statistics III (Sampling and Design) — Part I (Sampling techniques)
- Sampling techniques
- Design of experiments
- Econometrics
Statistics III (Sampling and Design) — Part II (Applied statistics and time series)
- Applied statistics and time series
- Statistical quality control
Statistics IV (Optional areas): Operations research and reliability & Demography and vital statistics
- Operations research and reliability
- Demography and vital statistics
- Survival analysis and clinical trials
- Quality control and process control
- Computer applications and data analysis
General Studies and General English: Current events & Indian polity, history and geography
- Current events
- Indian polity, history and geography
- Essay writing
- Precis and comprehension
UPSC ISS salary, pay scale, job profile & career growth
Pay Level 10 (basic pay around ₹56,100) plus allowances. Appointments under Union Public Service Commission (UPSC) carry structured pay progression, statutory allowances, and time-bound departmental promotions.
Pay Scale & Grade Structure
Pay Level 10 (basic pay around ₹56,100) plus allowances.
Appointing / Cadre Authority
Union Public Service Commission (UPSC) (Central Government / Public Sector Service)
Allowances & Perks
Dearness Allowance (DA), HRA (X/Y/Z cities: 30%/20%/10%), Transport Allowance, CGHS/Medical cover, LTC, and NPS contribution.
Probation & Training
Initial probation period (typically 1 to 2 years) with induction/foundation training before cadre confirmation.
Allowances, Perks & Service Benefits
- Dearness Allowance (DA) revised bi-annually in line with Consumer Price Index (AICPI)
- House Rent Allowance (HRA) or official government quarters / leased accommodation
- Transport Allowance (TA), Leave Travel Concession (LTC), and Children Education Allowance
- Comprehensive medical care (CGHS / ECHS / State Health Scheme) for employee and dependents
- National Pension System (NPS) employer contribution, gratuity, and paid maternity/paternity/study leave
Promotion Hierarchy & Career Progression
- Entry-Level Cadre Appointment (Post allotment & induction training under Union Public Service Commission (UPSC))
- Senior / Higher Grade Scale via Time-Bound Financial Upgradation (MACP / Dynamic ACP)
- Sectional / Supervisory / Inspector / Assistant Executive Cadre via Departmental Promotion Committee (DPC) or LDCE
- Middle Management / Gazetted / Divisional Officer Scale
- Senior Administrative / Directorate / Executive Leadership Cadre
UPSC ISS cut-off trends, score normalization and safe target score
Union Public Service Commission (UPSC) releases stage-wise and category-wise UPSC ISS cut-off marks at each stage (Prelims/Tier-I shortlisting, Mains/Tier-II evaluation, and Final Merit List). Candidates must clear both minimum qualifying standards and overall/sectional merit cut-offs to advance.
UPSC ISS — Qualifying Standards & Safe Target Benchmarks
| Category | Qualifying Floor / Standard | Recommended Safe Target |
|---|---|---|
| General / Unreserved (UR) | 30% to 40% Minimum Qualifying Floor | 72% to 82% of Total Marks (95+ Percentile in Mock Tests) |
| General — Economically Weaker Section (GEN-EWS) | 25% to 35% Minimum Qualifying Floor | 68% to 78% of Total Marks |
| Other Backward Classes (OBC-NCL) | 25% to 35% Minimum Qualifying Floor | 68% to 78% of Total Marks |
| Scheduled Caste (SC) / Scheduled Tribe (ST) / PwBD | 20% to 30% Minimum Qualifying Floor | 58% to 70% of Total Marks |
Score Normalization & Marking Impact
Because UPSC ISS is evaluated on a uniform single-session paper scale under one-third of the marks of a question deducted per wrong answer in the objective Statistics I and II papers, raw score accuracy directly determines your rank on the official merit list.
Factors Determining UPSC ISS Cut-Off
- Total number of notified vacancies / available seats across participating cadres and institutions
- Total number of registered vs actual appearing candidates in the UPSC ISS cycle
- Relative difficulty level of the question paper (and shift-wise variation in multi-shift CBT exams)
- Category-wise vertical (UR, EWS, OBC-NCL, SC, ST) and horizontal (PwBD, ESM, Women) reservation ratios
- Previous year cut-off trajectory and candidate score distribution at the top percentiles
UPSC ISS admit card, answer key and result guide
City slip 10–15 days prior • Admit Card 4–10 days before exam
UPSC ISS Exam City Intimation & Admit Card
Union Public Service Commission (UPSC) releases the advance Exam City Intimation Slip followed by the official UPSC ISS Hall Ticket / e-Admit Card on upsc.gov.in. No hard copy is sent by post; candidates must log in with their Registration Number and Date of Birth / Password to download it.
- Clear A4 printout of the UPSC ISS e-Admit Card with visible barcode and photograph
- Original valid Government Photo ID (Aadhaar Card, Passport, Voter ID, Driving Licence, or PAN Card)
- 2 recent passport-size photographs matching the image uploaded in the online application
- PwBD / Scribe certificate and undertaking (if availing compensatory time or scribe facility)
Within 3–10 days after the examination
UPSC ISS Provisional Answer Key & Objection Window
After conclusion of the objective test, Union Public Service Commission (UPSC) uploads the candidate response sheet and Provisional Answer Key on upsc.gov.in. Candidates can calculate their raw score and submit online representations against any ambiguous question or key discrepancy within the stipulated 48–72 hour window.
- Download your recorded Response Sheet PDF and match Question IDs with the Master Answer Key
- Calculate raw score using the official positive and negative marking formula
- Attach standard textbook / NCERT / official gazette proof if challenging any provisional key
- Review the Final Answer Key published after subject-expert scrutiny of all representations
3–6 weeks after stage completion
UPSC ISS Result, Scorecard & Merit List / Counselling
Union Public Service Commission (UPSC) declares the UPSC ISS result as a stage-wise Merit List PDF (with roll numbers and category cut-offs) and individual Normalized Scorecards on upsc.gov.in. Shortlisted candidates proceed to the next stage, Document Verification, or Centralised Counselling.
- Download and save your official UPSC ISS Scorecard / Rank Letter PDF immediately upon release
- Verify category-wise and sectional cut-off marks in the official result write-up notice
- Keep original matriculation, degree, caste/EWS, and domicile certificates ready for verification
- Track reserve list / multi-round seat allotment updates on the official website
UPSC ISS mock tests
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UPSC ISS Full Mock Test 1
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UPSC ISS previous year papers
Papers come with a solution for every question. Read them, or attempt them as timed tests. See all UPSC ISS previous year papers by year
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Recent UPSC ISS question papers
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Complete 10-year UPSC ISS paper archive
Up to 10 years of solved papers with SmartRank Pass (4 years with Learn)
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Predicted questions for UPSC ISS
High-probability questions and topics for your next exam
How to prepare for UPSC ISS
- Revise probability and inference deeply, as they form the base of both objective statistics papers.
- Practice numerical problems with a timer for Statistics I and II, where speed matters and negative marking applies.
- For Statistics III and IV, choose your areas early and prepare derivations and proofs in writing.
- Study the Indian official statistical system, including MoSPI, NSO and the census, for both the papers and the interview.
- Keep General English and General Studies in your plan; they are easy to score with regular writing practice.
- Read the official UPSC ISS notification carefully for the exact pattern, eligibility and selection stages.
UPSC ISS FAQs
Who can apply for the UPSC Indian Statistical Service exam?
Graduates with Statistics, Mathematical Statistics or Applied Statistics as a subject, or postgraduates in these subjects.
Is there negative marking in UPSC ISS?
Yes, in the objective Statistics I and II papers one-third of the marks of a question are deducted per wrong answer. The descriptive papers have no negative marking.
What is the age limit for UPSC ISS?
Candidates must be between 21 and 30 years on 1 August of the exam year, with the usual relaxation for reserved categories.
How many papers are there in the ISS exam?
Six written papers of 1000 marks in total (General English, General Studies and Statistics I to IV), followed by an interview of 200 marks.
What is the selection process and exam pattern for UPSC ISS?
UPSC ISS is conducted by Union Public Service Commission (UPSC) across 2 stages: Written examination → Viva voce (Interview). Final merit is the written examination (1000 marks across six papers, two objective and four descriptive) plus the viva voce (200 marks), followed by document verification and medical examination.
What is the age limit and educational qualification for UPSC ISS?
Educational Qualification: Bachelor's degree with Statistics, Mathematical Statistics or Applied Statistics as a subject, or a master's degree in Statistics, Mathematical Statistics or Applied Statistics. Age Limit: 21 to 30 years on 1 August of the exam year for the general category, with the usual relaxations.
What is the salary and job profile after clearing UPSC ISS?
Pay Level 10 (basic pay around ₹56,100) plus allowances.
When is the UPSC ISS notification released and how can I apply online?
UPSC ISS is held once a year, usually held together with the Indian Economic Service examination (Notification in April; written examination in June; viva voce later in the year). Online on upsc.gov.in through the One Time Registration (OTR) portal.
Where can I practice free UPSC ISS mock tests and solved previous year papers?
Select UPSC ISS as your target exam on SmartRank to get chapter-by-chapter study material built around its syllabus covering Statistics I (Probability and Inference), Statistics II (Linear models and Official statistics), Statistics III (Sampling and Design), Statistics IV (Optional areas), solved previous year question papers, topic and full-length mock tests in the exact UPSC ISS pattern, a timed exam simulator, subject-wise analytics, an adaptive daily study plan and an AI Tutor.
How can I prepare for UPSC ISS on SmartRank?
Select UPSC ISS as your target exam on SmartRank to get chapter-by-chapter study material built around its syllabus covering Statistics I (Probability and Inference), Statistics II (Linear models and Official statistics), Statistics III (Sampling and Design), Statistics IV (Optional areas), solved previous year question papers, topic and full-length mock tests in the exact UPSC ISS pattern, a timed exam simulator, subject-wise analytics, an adaptive daily study plan and an AI Tutor.