Prelims

UPSC Civil Services Preliminary Examination (UPSC Prelims) – Complete Guide

The Civil Services Examination (CSE) conducted by the Union Public Service Commission (UPSC) is one of the toughest competitive examinations in India. It is the gateway to prestigious services such as IAS, IPS, IFS and other Group-A and Group-B services of the Government of India.

The examination is conducted in three stages:

1. Preliminary Examination (Prelims)
2. Main Examination (Mains)
3. Personality Test (Interview)

The Preliminary Examination is the first stage and acts as a screening test for Mains.

1. Nature of UPSC Prelims

UPSC Prelims is an objective type (MCQ-based) examination.
Marks obtained in Prelims are NOT counted in the final ranking.
It is only a qualifying stage to select candidates for Mains.

Every year around:

• 10–12 lakh apply
• 5–6 lakh write exam
• Only ~12,000–15,000 qualify for Mains

So Prelims is actually the real elimination stage.

2. Papers in UPSC Prelims

Paper	Subject	Marks	Duration	Nature
Paper-I	General Studies (GS)	200	2 hours	Merit deciding
Paper-II	CSAT (Aptitude)	200	2 hours	Qualifying

Both papers are conducted on the same day.

Paper-I: General Studies (GS)

This paper decides whether you qualify for Mains.

• 100 Questions
• 200 Marks
• Each Question = 2 marks
• Negative Marking = 0.66 marks (1/3rd)

Paper-II: CSAT (Civil Services Aptitude Test)

• 80 Questions
• 200 Marks
• Each Question = 2.5 marks
• Negative Marking = 0.83 marks
• Qualifying paper — you only need 33% (66 marks)

⚠️ If you fail CSAT, your GS paper is not evaluated.

3. Syllabus of UPSC Prelims

General Studies (GS) Syllabus

UPSC does not ask direct factual questions. It tests conceptual understanding + analytical ability.

Topics:

1. Current Events of national and international importance
2. History of India and Indian National Movement
3. Indian and World Geography (Physical, Social, Economic)
4. Indian Polity and Governance (Constitution, Panchayati Raj, Public Policy, Rights Issues)
5. Economic and Social Development (Poverty, Inclusion, Demographics, Social Sector Initiatives)
6. Environment and Ecology (Biodiversity, Climate Change)
7. General Science (basic concepts, not advanced science)

CSAT Syllabus

1. Comprehension passages
2. Logical reasoning
3. Analytical ability
4. Decision making
5. Basic numeracy (Class X level maths)
6. Data interpretation
7. 4. Medium and Language
   
   • Question paper: English & Hindi
   • Candidate can choose Mains medium (English or any 8th Schedule language)
   • CSAT comprehension passages are in English and Hindi

   5. Eligibility Criteria

   Educational Qualification

   • A candidate must hold a Bachelor’s Degree from a recognized university.
   • Final year students can also apply.

   Nationality

   • IAS & IPS: Must be an Indian citizen
   • Other services: Some allow Nepal/Bhutan citizens

   6. Age Limit & Attempts

   Category	Age Limit	Attempts
   General	21–32 years	6
   OBC	21–35 years	9
   SC/ST	21–37 years	Unlimited (till age limit)
   PwBD	Additional relaxation	As per category

   Age is calculated as on 1st August of exam year.

   7. Negative Marking Rule

   Very important for beginners.

   • 1/3rd marks are deducted for wrong answer
   • No penalty for unanswered questions
   • Multiple marking → treated as wrong

   This means random guessing is dangerous.

   8. Cut-Off Marks (Trend)

   Approximate GS cut-off (General category):

   Year	Cut-off
   2023	~75–80
   2022	~88
   2021	~87
   2020	~92
   2019	~98

   👉 Cut-off changes every year depending on paper difficulty.

   9. Important Books for Prelims Preparation

   Polity

   • M. Laxmikanth – Indian Polity (Most Important Book)

   History

   • Spectrum – Modern India
   • NCERT Class 6–12 History

   Geography

   • NCERT 6–12
   • G.C. Leong (Physical Geography)

   Economy

   • NCERT 9–12
   • Basic Economy Book (any standard UPSC economy book)

   Environment

   • Environment book (Shankar IAS preferred by many)

   Current Affairs

   • Newspaper (The Hindu / Indian Express)
   • Monthly Current Affairs Magazine

   10. Preparation Strategy

   Step 1: First Build Basics (2–3 months)

   • Read NCERTs (Class 6–12)
   • Understand concepts
   • Do not memorize initially

   Step 2: Standard Books

   • Laxmikanth
   • Spectrum
   • Geography
   • Environment

   Step 3: Current Affairs (Most Important)

   UPSC Prelims is now current affairs based.

   You must:

   • Read newspaper daily
   • Make short notes
   • Revise monthly

   Step 4: MCQ Practice

   This is the real key to clearing Prelims.

   Solve:

   • Previous Year Questions (PYQs)
   • Daily practice questions
   • Mock tests

   11. Biggest Mistakes Aspirants Make

   1. Only reading, not solving MCQs
   2. Ignoring CSAT
   3. Studying too many books
   4. Not revising
   5. Guessing blindly in exam

   12. How Many Questions to Attempt?

   Safe strategy (General category):

   • Attempt: 75–85 questions
   • Accuracy: 60–70%

   Accuracy matters more than attempts.

   13. Timeline of UPSC Exam

   Event	Month
   Notification	February
   Application	February–March
   Prelims Exam	May/June
   Result	June/July
   Mains	September
   Interview	January–April
   Final Result	April/May

   14. Key Truth About UPSC Prelims

   UPSC does not test memory.
   It tests:

   • elimination ability
   • conceptual clarity
   • intelligent guessing
   • presence of mind

   15. Final Advice for Beginners

   If you are starting preparation:

   Focus on:

   • Revision
   • PYQs
   • Mock Tests
   • Current Affairs

   Consistency beats intelligence in UPSC.