Negative Marking in UPSC Prelims Explained

Fact: UPSC clearly mentions in the Prelims instructions that wrong answers in objective-type papers will attract a penalty, generally equal to one-third of the marks assigned to that question.

Fact: If a question carries, for example, 2 marks, a wrong answer typically results in a deduction of about 0.66 marks from your total for that paper.

Understanding this system is crucial because your net score — total correct marks minus penalties — decides whether you clear the Prelims cut-off.

Fact: Occasionally, if UPSC finds that a question had more than one correct answer or was flawed, instructions in the official answer key explain how marks are awarded (for example, to all candidates who attempted or did not attempt that question).

Fact: These situations and their marking rules are clarified only through official documents such as answer keys and FAQs; rumours or unofficial keys cannot be treated as authoritative.

For aspirants, the best practice is to focus on strong conceptual preparation and not overthink rare exceptional cases, trusting that UPSC follows its own published guidelines during evaluation.

Fact: Because each wrong answer subtracts marks, over-attempting low-confidence questions can reduce your net score and push you below the cut-off, even if your number of correct answers is high.

Fact: Leaving a question blank carries no direct penalty, so the trade-off is between potential gains from a correct guess and the risk of a one-third mark loss.

A practical approach is to attempt questions where you can eliminate one or two options confidently and avoid questions where you have no clue at all. Regular mock tests help you discover your ideal attempt range.

Fact: Negative marking also applies to CSAT (GS Paper II), which is qualifying with a 33% requirement.

Fact: Random guessing in CSAT can drag you below the qualifying line, especially in difficult years where many candidates already find the paper challenging.

For CSAT, it is safer to focus on questions where you are reasonably confident, particularly in comprehension and reasoning. Test papers during preparation should be analysed to see how many questions you can safely attempt while still maintaining accuracy.

Fact: Your ideal number of attempts in GS Paper I and CSAT depends on your accuracy; there is no universal magic number.

Analysing mock tests — tracking how many questions you attempted, how many were correct, and how many marks you lost to negative marking — helps you discover whether you should attempt more or fewer questions.

Institutes like PrepiQ help aspirants review mocks not only for content errors but also for attempt strategy, so that by the time of the actual exam, your risk appetite is data-driven rather than emotional.