How Many Questions to Attempt in UPSC Prelims
“How many questions should I attempt in UPSC Prelims?” is one of the most common searches in the weeks before the exam. The honest answer is that there is no magic number. A candidate who attempts 70 questions with clean accuracy can clear. A candidate who attempts 95 and sprays guesses can fall below the cut-off with a higher attempt count.
The Civil Services Examination 2026 rules tell you how the penalty works. They do not tell you to attempt 80, or 85, or 90. Use the rule, then decide question by question.
What the notice actually says#
The Preliminary Examination has two papers of 200 marks each. Each paper is two hours. Marks from Prelims are not added to your final rank. They only decide who is admitted to Mains. The Commission says that number is about twelve to thirteen times the vacancies.
Two conditions apply together:
- You need the minimum qualifying mark of 33 percent in General Studies Paper II, the CSAT paper.
- Among those who clear that bar, the Commission sets a qualifying total on General Studies Paper I.
Paper II does not raise your merit. It can only remove you. A separate note on clearing that bar is in How to Clear UPSC CSAT.
Negative marking, from the CSE 2026 plan of examination, has three lines:
- There are four alternatives. For a wrong answer, the penalty is one-third of the marks assigned to that question.
- If you mark more than one answer, it is treated as wrong even if one of them is correct, and the same penalty applies.
- A blank question has no penalty.
In recent Prelims booklets, Paper I has been 100 questions and Paper II has been 80. The exact marks per question are printed on that year’s paper. Read them. If a question carries 2 marks, one-third is about 0.67 marks. If it carries 2.5 marks, one-third is about 0.83 marks. The notice’s phrase “one-third (0.33)” means one-third of the marks of that question, not a flat 0.33 marks off your paper.
Why a random guess is a wash#
Take a question you cannot narrow down. Four options, one correct.
- Chance of being right: 1 in 4. You gain the full marks.
- Chance of being wrong: 3 in 4. You lose one-third of those marks.
The gains and losses cancel. Over many blind guesses, you should expect about zero. You also add swings. Five lucky guesses feel like skill. Five unlucky ones drop you under a cut-off you would have cleared by leaving them blank.
So the rule is simple. If you cannot eliminate an option, leave it blank. Blank is not brave, and it is not cowardly. It is the same expected score as a blind guess, with less risk of a bad run.
When a guess is worth taking#
The penalty turns in your favour as soon as you can strike one option out for a reason.
- One option removed, three left. You are right about one time in three. The wrong answers still cost one-third each. The expected result is a small gain. Take the guess if your elimination is real.
- Two options removed, two left. You are right about half the time, and the penalty on the wrong half is only one-third of the marks. This is a guess you should take.
- You know the answer. Mark it and move on. Second-guessing a sure question is how people lose marks they had already earned.
“Real” elimination means you can say why that option breaks a fact, a date, a definition, or the grammar of the sentence. “This option feels unfamiliar” is not elimination. Unfamiliar options are often correct in this exam.
A quick example: a polity question lists four bodies, and you know one of them is not a constitutional body. Kill that option and guess among the other three. If you only “feel” that the unfamiliar name is wrong, you have not killed anything. Leave it blank. One honest elimination is enough to make the guess rational. A hunch is not.
A practical order in the hall#
Use one pass, then a short second pass. Do not invent a third personality for the last ten minutes.
First pass. Read the question to the end, including “not” and “only.” Mark it in one of three ways in the question booklet, not only on the answer sheet:
- Sure. Bubble it now.
- Two options left, or one option clearly dead. Star it.
- No idea. Leave it blank on the sheet and do not return unless time is left.
Second pass. Spend the remaining time on starred questions only. Apply the rule above. Then stop. Filling the rest of the sheet in the last three minutes is how a decent Paper I becomes a fail.
Budget the bubbling. Changing an answer needs a clean erase. A half-erased bubble can be read as two answers, and two answers are a wrong answer with a penalty.
What the attempt count is really measuring#
After a mock, people announce “I attempted 88.” That number hides the only split that matters:
| Type | What to do next |
|---|---|
| Sure, and correct | Keep the source. Do not add a new book. |
| Sure, and wrong | This is a concept hole or a misread. Fix the page. |
| Calculated guess, correct | Note which option you killed, so you can repeat the method. |
| Calculated guess, wrong | Your elimination was false. Write the line you misunderstood. |
| Blind guess | Stop doing this in the next mock, even if it was lucky. |
| Blank, but you knew it | This is fear or slow reading, not a content gap. |
If your sure-and-wrong pile is large, attempting more questions will lower the score. If your blank-but-knew pile is large, you are leaving marks you had. Speed comes from fewer re-reads, not from a higher attempt target.
The PYQ method belongs here. Ten years of questions on one topic teach you which traps repeat. A mock without that log is just a number.
Paper I and Paper II are not the same decision#
On Paper I, the score decides whether you go to Mains, once CSAT is cleared. Accuracy is the whole game. Chasing 90-plus attempts because a topper did it ignores that the topper’s “attempt” included many questions they actually knew.
On Paper II, you only need the qualifying mark. Extra marks do not help rank. Reckless guessing can push a passing paper under 33 percent. If you are comfortably above the line with twenty minutes left, protect the score. If you are short, use only the two-option guesses. The full routine is in How to Clear UPSC CSAT.
How to practise the rule before May#
From January, take sectional tests with the penalty switched on. A test that does not deduct one-third is teaching the wrong habit.
Once a week, sit a previous Paper I in two hours. Score it three ways: raw correct, after penalty, and after you remove every blind guess. The third number is your real level. The gap between the second and the third is luck.
In April and May, full mocks matter more than new content. The CSE 2027 October plan puts that sprint after the books are already read. Do not start the attempt-count obsession in October. Start the elimination habit when PYQs begin.
FAQ#
Is 80 attempts enough to clear Prelims?#
Sometimes yes, sometimes no. It depends on how many of those 80 are correct after the penalty. Copying an attempt count from a video is not a strategy.
Should I guess if I am stuck between two options?#
Yes. With two options left, the expected score of a guess is positive. With four options left, leave it blank.
Does a blank answer get a penalty?#
No. The CSE 2026 rules say a question with no answer has no penalty.
Do Prelims marks count in the final rank?#
No. They only screen you for Mains. Final rank uses the Mains papers that count, plus the 275-mark Personality Test.
What to do on the next mock#
Score the paper. Cross out every blind guess before you celebrate the total. Keep a one-page list of sure-but-wrong topics, and revise those pages before you raise your attempt count.