UPSC Prelims 2027 Exam Pattern, Marking and Statement-Question Formats

The UPSC Civil Services (Preliminary) Examination is a screening test of two objective papers taken on the same day. This post follows the scheme in UPSC's Examination Notice No. 05/2026-CSE, dated 4 February 2026. UPSC uploaded its Annual Calendar 2027 on 20 May 2026; for the 2027 dates, see our UPSC Prelims exam date page. Check the scheme in the notice for the 2027 examination on upsc.gov.in, in case anything changes.

UPSC Prelims exam pattern at a glance

The marks, time and penalty come from the notice. The notice does not fix the number of questions in each paper, so read the instructions on the cover of the question booklet on exam day.

Other rules from the notice:

• Both papers are compulsory. A candidate who does not appear in both papers is disqualified.
• Language: the question papers are set in both Hindi and English.
• Compensatory time: candidates with blindness, locomotor disability (both arms affected) or cerebral palsy get twenty minutes per hour of the examination. Candidates in other benchmark disability categories can get it on producing a certificate, from a government health care institution in the format the notice prescribes, that they have a physical limitation to write.
• Number called to Mains: about twelve to thirteen times the approximate number of vacancies for the year.

For a section-by-section view and the syllabus, see the UPSC Prelims exam pattern page and the CSAT syllabus.

Negative marking: one-third per wrong answer

Every question has four options. Note II in Section I of Appendix I of the notice sets three rules:

1. For each wrong answer, one-third of the marks given to that question is deducted.
2. Marking more than one option is treated as a wrong answer, even if one of the marked options is right.
3. A question left blank gets no penalty.

The notice writes the penalty as "one-third (0.33)" of the marks assigned to the question.

The one-third rule has a simple consequence. Call the marks for a question M. If you guess at random among four options, you expect to be right 1 time in 4 and wrong 3 times in 4: (1/4 × M) − (3/4 × M/3) = M/4 − M/4 = 0. A pure guess is worth nothing on average. If you can rule out one option and guess among the remaining three, the average becomes (1/3 × M) − (2/3 × M/3) = M/9, which is above zero. This is why the way a question limits elimination matters so much.

CSAT is qualifying, and Prelims marks do not count in the final merit

Note I in Section I of Appendix I of the notice says UPSC draws the list of candidates qualified for Mains using two conditions:

• at least 33% in General Studies Paper II (CSAT), which is 66 out of 200; and
• the total qualifying marks in General Studies Paper I that the Commission decides.

So CSAT marks are not added to the GS Paper I score, but missing 66 in CSAT means you are not on the list however well you did in GS Paper I. The Paper I qualifying marks are not a fixed number; UPSC decides them for each year.

The notice also says Prelims is "a screening test only". The marks of candidates who qualify for Mains are not counted for their final order of merit. The final ranking comes from the Mains written papers that count for ranking and the Interview/Personality Test.

Statement-based question formats

Statement-based questions give you a set of statements or pairs and ask you to judge them. Common structures are the code format (options such as "1 and 2 only"), the "How many" format, pair matching, and Statement-I/Statement-II. To see how UPSC actually uses them, study the original papers on our previous year papers page.

The examples below are our own, written to show the structure. They are not UPSC questions.

Format 1: "How many of the above statements are correct?"

Consider the following statements:

1. Light travels faster in water than in air.
2. Sound cannot travel through a vacuum.
3. Water boils at a lower temperature at higher altitudes.

How many of the above statements are correct? (a) Only one (b) Only two (c) All three (d) None

Statement 1 is wrong and statements 2 and 3 are right, so the answer is (b) Only two.

Format 2: "How many pairs are correctly matched?"

How many of the above pairs are correctly matched? (a) Only one (b) Only two (c) All three (d) None

The Victoria Memorial is in Kolkata, so only the first two pairs are right: (b).

Format 3: Statement-I and Statement-II

Statement-I: Ice floats on liquid water. Statement-II: Ice is less dense than liquid water.

Which one of the following is correct in respect of the above statements? (a) Both statements are correct and Statement-II explains Statement-I (b) Both statements are correct but Statement-II does not explain Statement-I (c) Statement-I is correct but Statement-II is incorrect (d) Statement-I is incorrect but Statement-II is correct

Both are true and the lower density is the reason ice floats, so the answer is (a). Here you need three judgements: is Statement-I true, is Statement-II true, and does II explain I.

Why these formats limit elimination

In the code format, the options name specific statements. If you are sure one statement is wrong, every option that includes it drops out. Often knowing two statements is enough to reach one option.

In the "How many" format, the options give only a count. Knowing one statement tells you almost nothing about the count. Take the first example above:

To answer a "How many" question with certainty, you must judge every statement. Pair matching works the same way, because a correct count needs every pair checked. In Statement-I/Statement-II questions, knowing the two facts is not enough unless you also know whether one explains the other, which is why options (a) and (b) are hard to separate.

Combined with the one-third penalty, this means a partly known question is often closer to a random guess than it looks. One way to practise is to mark, for each statement, whether you are sure, unsure or have no idea, and to answer only when your sure statements actually fix the option.

How to use this pattern

1. Plan GS Paper I as the scoring paper. It is the only Prelims paper that decides the Mains list, so most preparation time goes here.
2. Do not ignore CSAT. It is qualifying, but 66 out of 200 must be reached. Take a timed CSAT paper early to see where you stand.
3. Practise the formats in timed sets. Train yourself to judge each statement separately, since that is what "How many" and pair questions require.
4. Track your accuracy. Count how many attempted questions you get wrong; with a one-third penalty, a high error rate quickly cancels out right answers.

You can take full GS Paper I and CSAT tests with the one-third negative marking in our live UPSC tests.