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The UPSC Civil Services Examination (CSE) is structured across three sequential stages: the Preliminary Examination, the Main Examination, and the Personality Test (Interview). Each stage eliminates candidates, so only those who clear each gate move to the next. Understanding the exact marks, duration, and qualifying thresholds at every stage is non-negotiable — it shapes how you allocate your time, choose your optional subject, and build your answer-writing strategy. Here is a complete breakdown of every paper, every mark, and every rule you need to know.

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The Three Stages at a Glance

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Stage 1: Preliminary Examination

An objective, multiple-choice screening test. Marks from this stage do not count toward your final merit — Prelims only determines who qualifies for Mains.
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Stage 2: Main Examination

A written examination of nine papers, of which seven are merit-ranked. This stage carries 1,750 marks toward your final score.
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Stage 3: Personality Test (Interview)

A structured interview conducted by a UPSC board, carrying 275 marks. Combined with Mains, this determines your final rank and service allocation.

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Stage 1: Preliminary Examination

The Prelims consists of two objective papers held on the same day. Both papers use printed booklets with OMR answer sheets. Only GS Paper I determines your Mains cutoff — CSAT Paper II is purely qualifying.

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GS Paper I

Each wrong answer in GS Paper I costs you 0.66 marks (one-third of 2 marks). Avoid blind guessing — a wrong answer on an unattempted question costs nothing, but a wrong answer on a guessed question swings your net score by nearly a mark.

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CSAT Paper II

CSAT is qualifying in nature. You only need to score 33% (66 out of 200 marks) to clear this paper. Your rank in the Prelims cutoff is determined entirely by your GS Paper I performance.

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Stage 2: Main Examination

The Mains is a conventional written examination spread over five to six days. It consists of nine papers in total — two qualifying papers (Paper A and Paper B) and seven papers that are counted for merit. The total merit marks are 1,750.

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Paper Structure

Papers A and B are qualifying. You must score at least 25% (75 marks out of 300) in each. If you fail to qualify either paper, your remaining Mains papers will not be evaluated — regardless of how well you performed on them.

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Mains Merit Summary

Your optional subject contributes 500 out of 1,750 Mains marks — roughly 28.5% of your written score. Choose your optional carefully, weighing both your genuine interest and the availability of quality study material.

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Stage 3: Personality Test (Interview)

Candidates who qualify the Mains are called for the Personality Test, conducted at the UPSC headquarters in New Delhi. A board of UPSC members assesses you on mental alertness, critical assimilation, clarity of exposition, balance of judgement, variety and depth of interest, ability for social cohesion and leadership, and intellectual and moral integrity.

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Final Merit and Service Allocation

Your final rank is calculated on a combined total of 2,025 marks — the sum of your Mains merit score and your Interview score. Based on your final rank and your service preference order submitted in the DAF, UPSC allocates services including IAS (Indian Administrative Service), IPS (Indian Police Service), IFS (Indian Foreign Service), and over two dozen other Central Services. Higher-ranked candidates have first pick of the more sought-after services.
The UPSC exam pattern has remained largely stable over the years, but always cross-check the official notification for any year-specific changes at upsc.gov.in.