THE SHORT VERSION

What you’ll take away.

  • Treat CSAT as a regular part of preparation even though it is qualifying.
  • Distinguish a concept error from a calculation or reading error.
  • Track the base when calculating successive percentage changes.
  • A conclusion must follow from the given information, not an assumption.
  • Use full official papers to check progress beyond these introductory examples.

If you find a CSAT question difficult, “practise more” is only part of the answer. You first need to know what went wrong. Did you misunderstand the concept, choose the wrong operation, miss a word, or run out of time?

The examples below are original introductory practice questions, not UPSC previous-year questions. Use them to understand the review method, then apply it to full official papers.

Know what qualifying means

Under the 2026 CSE scheme, CSAT is qualifying at 33% of 200 marks. You still need to qualify it for your GS I performance to count toward Prelims selection. Read the notice for your own examination year before relying on a rule.

Begin with a recent official GS Paper II. Attempt it under its printed conditions when you are ready, and use an official answer key where available. Label any provisional third-party key as such.

A single score is less useful than a record showing which types of mistakes recur.

Example 1: successive percentages

Practice question: A book’s price rises from ₹200 by 20%, then falls by 20%. What is the final price?

  • A. ₹200
  • B. ₹192
  • C. ₹196
  • D. ₹180

Answer: B, ₹192.

The increase is 20% of ₹200, or ₹40. The new price is ₹240. The reduction is now 20% of ₹240, or ₹48. Subtracting gives ₹192.

The two percentages use different bases. You cannot simply cancel “plus 20%” and “minus 20%.” If you chose A, write “check the base” beside the error and try another example with different numbers.

Example 2: work rates

Practice question: A can finish a task in 12 days and B can finish the same task in 18 days. At constant independent rates, how long would they take together?

  • A. 6 days
  • B. 7.2 days
  • C. 15 days
  • D. 30 days

Answer: B, 7.2 days.

A completes 1/12 of the task each day, and B completes 1/18. Their combined daily rate is 3/36 + 2/36 = 5/36. The time for one whole task is therefore 36/5 days.

The assumption about constant independent rates belongs to this mathematical model. Do not add the completion times; add the rates.

Example 3: a conclusion that does not follow

Practice question: All roses in a garden are flowers. Some flowers in the garden fade quickly. Must some roses fade quickly?

  • A. Yes
  • B. No; the conclusion is not established by the statements

Answer: B.

The flowers that fade quickly could all be flowers other than roses. The statements do not tell you whether the two groups overlap. The task is to reason from the given information, not from what might happen in a real garden.

If you selected A, draw two possible arrangements: one with overlap and one without it. Seeing both will show why the conclusion is not compulsory.

Example 4: read the limit of a claim

Original practice passage: A library added weekend opening hours. Weekend visits increased, but total weekly visits stayed unchanged. Some weekday visitors may have shifted their visits to the weekend.

Question: Which conclusion is best supported?

  • A. Longer opening hours always increase total use.
  • B. The library gained no new users.
  • C. The timing of visits changed, but the passage does not establish a rise in total weekly visits.
  • D. Every weekday visitor moved to weekends.

Answer: C. The passage reports an increase in weekend visits and unchanged weekly totals. It does not identify every visitor or prove the universal claims in A and D. Unchanged visits also do not establish that there were no new users.

Turn each mistake into a next task

Mistake Useful next step
You did not understand the concept Relearn it with one worked example
You chose the wrong operation Explain why the correct operation fits
You misread a condition Mark the condition and reattempt slowly
You made an arithmetic slip Check the calculation separately
You could solve it but took too long Repeat similar problems, then practise under time limits

During the week, alternate focused practice with mixed sets. Gradually use full papers to check whether the improvement carries across topics and under time pressure.

When you review, include questions you answered correctly by guessing. A correct option is not evidence of a reliable method unless you can explain it.

Fit this work into the first-month plan. Keep your error notebook brief enough that you will actually revisit it.

Sources and information checks

Source information checked: . For a new application or exam cycle, also read the applicable official notice.

This article was prepared or revised with AI assistance. Read our editorial policy.

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