CSAT Answer Key 2025: Download GS Paper 2 Answer Key PDF With Solutions

CSAT Answer Key 2025 (unofficial) is now available to download in this article! The UPSC Civil Services Aptitude Test (CSAT) is the second paper of UPSC Civil Services Prelims, which was conducted from 2:30 to 4:30 PM on 25th May, 2025. Also known as General Studies Paper 2, the CSAT Paper consists of a total of 80 questions asked for 200 marks. The Union Public Service Commission will be releasing the official CSAT Answer Key 2025 after the complete selection process, including Mains and Interview rounds, are over. In the meantime, candidates can refer to the unofficial CSAT Answer Key 2025 PDF released by Testbook. If you are looking to estimate your UPSC CSAT scores or planning for future attempts, download the set-wise answer key for Prelims GS Paper 2 provided in this article and find out how to use the answer key to estimate your Prelims marks. 

CSAT 2025 Answer Key (Unofficial) OUT

Testbook has released the unofficial CSAT Answer Key 2025 for candidates’ reference! The official CSAT Answer Key 2025 will be released by the Union Public Service Commission after the entire UPSC selection process is completed, tentatively in June-July 2026. Meanwhile, aspirants can refer to the unofficial answer key prepared by expert faculty at Testbook in order to analyze their performance, estimate Prelims marks, and prepare for future attempts. The UPSC Prelims 2025 was conducted on 25th May, 2025 in two sessions, each for GS Paper 1 and the CSAT, on the same day. The UPSC CSAT paper comprises 80 questions, each carrying 2.5 marks, with a negative marking of 0.83 for every incorrect answer. A minimum of 33% (66 marks) is required to qualify. Using the unofficial CSAT 2025 Answer Key and the official marking scheme, candidates can estimate their scores and predict their chances of qualifying for the UPSC Mains. 

Also go through CSAT Subject Wise Question Weightage.

CSAT Answer Key 2025 (Unofficial): Set Wise PDF Download

Download the set wise CSAT Answer Key 2025 PDF from the table given below – 

Also download – CSAT 2025 Question Paper

How to Download CSAT Answer Key 2025?

The official UPSC CSAT 2025 Answer Key 2025 will be released by the Union Public Service Commission after the Mains and Interview round has concluded, tentatively in June-July, 2026. Meanwhile, candidates can refer to the unofficial CSAT Answer Key 2025 released by Testbook. Once released, candidates will be able to download the official answer key from the official website of UPSC @upsc.gov.in. In the meantime, candidates must refer to the unofficial Answer Key PDF provided on this page to practice for future attempts or self-evaluate their Prelims score. Follow the steps given below to download the official UPSC CSAT 2025 Answer Key PDF – 

• Step 1 – Visit the Official UPSC Website

Go to the official website of the Union Public Service Commission @https://www.upsc.gov.in. This site is the authoritative source for all UPSC-related notifications, including examination schedules, results, and answer keys.

• Step 2 – Navigate to the 'Examinations' Section

On the UPSC homepage, locate the top navigation menu. Hover your cursor over the "Examinations" tab to reveal a dropdown menu.

• Step 3 – Select 'Answer Keys' from the Dropdown

From the dropdown menu under "Examinations," click on the "Answer Keys" option. This will direct you to a page with answer keys PDFs for various examinations conducted by UPSC.

• Step 4 – Find the CSAT Answer Key for 2025

On the "Answer Keys" page, scroll through the list to locate the entry titled "Civil Services (Preliminary) Examination, 2025 – General Studies Paper II (CSAT)." 

• Step 5 – Download CSAT Answer Key PDF

Click on the link corresponding to the CSAT answer key. The PDF document will open in a new tab or window. Review the document to ensure it matches your question paper set (A, B, C, or D). Once confirmed, download and save the PDF to your device for future reference.

Estimate your Prelims Score using the UPSC Marks Calculator & Negative Marking Calculator.

How to Estimate Marks Using CSAT 2025 Answer Key?

Using the unofficial CSAT 2025 answer key, candidates can estimate their Prelims score for GS Paper 2 before the final UPSC Prelims Result 2025 is declared! To estimate the CSAT score, candidates must apply the marking scheme prescribed by the Union Public Service Commission for GS Paper 2. This official marking scheme is provided below –

• Correct Answer: +2.5 marks
• Incorrect Answer: –0.83 marks (1/3rd of 2.5)
• Unanswered: 0 marks

Now, follow the steps given below to use the CSAT Answer Key 2025 to estimate your marks in the CSAT paper –

• Step 1 – Obtain the unofficial CSAT 2025 answer key corresponding to your question paper set (A, B, C, or D).
• Step 2 – Tally your answers with the answer key to count the number of correct and incorrect responses.
• Step 3 – Apply the official Marking Scheme – 

1. Award yourself +2.5 marks for each correct answer.
2. Deduct 0.83 marks for each incorrect answer, as per the negative marking policy

• Step 4 – Use the formula to calculate your total score for GS Paper 2 –
   

Ensure your total score is at least 66.67 marks (33% of 200) to qualify the CSAT paper.

Last 10 Years’ CSAT Answer Key With Question Paper [2024-2013]

For aspirants who are preparing for the upcoming Civil Services Prelims, it is crucial to refer to the previous year answer keys 

Accessing the last 10 years' UPSC CSAT (Civil Services Aptitude Test) question papers and answer keys (2013–2024) is crucial for aspirants aiming to understand the exam pattern, question trends, and difficulty levels. These resources aid in effective preparation and self-assessment. You can download the PDFs of both question papers and answer keys 

Also download year-wise UPSC Answer Key for last-minute revision using previous question papers – 

• UPSC Prelims 2024 Answer Key
• UPSC Prelims 2023 Answer Key
• UPSC Prelims 2022 Answer Key
• UPSC Prelims 2021 Answer Key

We hope you found this UPSC CSAT 2025 Answer Key useful in your exam preparation! Download the Testbook App now to get last-minute preparation tips and best-in-class study materials, test series and expert coaching for IAS Preparation!