UPSC Prelims 2025 Answer Key for GS Paper 1 & CSAT
The UPSC Prelims 2025, held on May 25, 2025, was a huge deal for thousands of students chasing a spot in India’s Civil Services. Put together by the Union Public Service Commission (UPSC), this exam is the first hurdle in the Civil Services Examination (CSE). It’s got two parts: General Studies Paper 1 (GS Paper 1) and Civil Services Aptitude Test (CSAT) Paper 2. The official UPSC Prelims Answer Key 2025 won’t show up until April or May 2026, after the final results are out. But here’s the good news—Guru’s Ashram IAS has already dropped unofficial answer keys for both papers, so you can check your answers and guess your score today.
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Also Check: UPSC Prelims Question Paper 2025
What Was UPSC Prelims 2025 Like?
On May 25, 2025, the UPSC Prelims 2025 took place at exam centers all over India. It had two papers:
- GS Paper 1: This checks what you know about History, Geography, Polity, Economy, Environment, Science, and Current Affairs. It’s got 100 questions worth 200 marks.
- CSAT Paper 2: This ran from 2:30 PM to 4:30 PM and tests your reading, reasoning, and math skills. It has 80 questions, worth 200 marks, but you only need 33% (66 marks) to pass and get your GS Paper 1 looked at.
Folks who took the exam said the UPSC Prelims 2025 was medium-tough. The CSAT Paper 2 had a bunch of reading comprehension questions, which tripped up some people. But the exam wasn’t too different from UPSC Prelims 2023 or 2022, so no big shocks. The CSAT leaned hard on thinking skills, but it stayed close to what we’ve seen before.
Official vs. Unofficial Answer Keys
Official UPSC Prelims Answer Key 2025
The official UPSC Answer Key 2025 for GS Paper 1 and CSAT Paper 2 won’t come out until the whole exam process (Prelims, Mains, and Interview) is done, probably in April or May 2026. It’ll also tell you if any questions got dropped, like the three that didn’t count in UPSC Prelims 2024. You can find it on upsc.gov.in.
Unofficial UPSC Prelims Answer Key 2025
While you wait, Guru’s Ashram IAS has unofficial answer keys ready. These are made by pros and come as PDFs for all sets (A, B, C, D). They often toss in explanations to show why an answer’s right, so you can quickly check your UPSC Prelims 2025 GS Paper Answer Key and UPSC CSAT Paper 2 Answer Key 2025.
How to Grab the UPSC Prelims Answer Key 2025
Downloading the Official Answer Key
When the official UPSC Prelims Answer Key 2025 comes out, here’s the plan:
- Go to upsc.gov.in.
- Hit “Examinations” on the homepage.
- Click “Answer Keys” in the menu.
- Look for “UPSC Prelims Answer Key 2025” for GS Paper 1 or CSAT Paper 2.
- Download the PDF and keep it handy.
Downloading Unofficial Answer Keys
You can snag unofficial answer keys from Guru’s Ashram IAS on their website or X posts. Here’s where to find the UPSC Prelims 2025 Answer Key for GS Paper 1 and CSAT Paper 2:
UPSC Prelims 2025 GS Paper Answer Key (Set A, B, C, D)
Set |
Answer Key PDF |
| Set A | Download PDF (#) |
| Set B | Download PDF (#) |
| Set C | Download PDF (#) |
| Set D | Download PDF (#) |
UPSC Prelims CSAT Answer Key 2025 (Set A, B, C, D)
Set |
Answer Key PDF |
| Set A | Download PDF (#) |
| Set B | Download PDF (#) |
| Set C | Download PDF (#) |
| Set D | Download PDF (#) |
Tip: Stay tuned to Guru’s Ashram IAS website or X for the latest UPSC Prelims 2025 Answer Key Set B, Set D, or other sets.
How to Check Your Score
Use the UPSC Prelims Answer Key 2025 to see how you did. Here’s how the marks break down:
GS Paper 1
- Questions: 100
- Total Marks: 200
- Correct Answer: +2 marks
- Wrong Answer: -0.66 marks (you lose a bit)
- Unanswered: 0 marks
CSAT Paper 2
- Questions: 80
- Total Marks: 200
- Correct Answer: +2.5 marks
- Wrong Answer: -0.83 marks
- Unanswered: 0 marks
How to Figure It Out
- Count your correct answers. Multiply by 2 for GS Paper 1 or 2.5 for CSAT.
- Count your wrong answers. Multiply by 0.66 for GS Paper 1 or 0.83 for CSAT.
- Subtract the wrong marks from the correct ones.
- For CSAT Paper 2, you need at least 66 marks (33%) to qualify.
Example
- GS Paper 1: 60 correct, 20 wrong
- Correct: 60 × 2 = 120 marks
- Wrong: 20 × 0.66 = 13.2 marks
- Total: 120 – 13.2 = 106.8 marks
- CSAT Paper 2: 50 correct, 10 wrong
- Correct: 50 × 2.5 = 125 marks
- Wrong: 10 × 0.83 = 8.3 marks
- Total: 125 – 8.3 = 116.7 marks (you’re in the clear, since it’s above 66)
What Was in UPSC Prelims 2025?
GS Paper 1
The UPSC Prelims 2025 GS Paper Answer Key says the paper was medium-tough:
- Topics: Questions hit History, Geography, Polity, Economy, Environment, Science, and Current Affairs.
- Difficulty: Felt a lot like UPSC Prelims 2023, with a big focus on understanding and real-world stuff.
- Standout: Current affairs and questions that make you think were front and center.
CSAT Paper 2
The UPSC CSAT 2025 Answer Key shows a medium-tough paper:
- Reading Comprehension: A ton of questions on reading and figuring things out.
- Reasoning & Math: A mix of questions, with a few that were kind of hard.
- Pattern: Pretty close to UPSC CSAT 2023, no big surprises.
You can grab the UPSC Prelims 2025 Question Paper and UPSC CSAT 2025 Question Paper (including Hindi versions) from Guru’s Ashram IAS website to match with the UPSC CSAT Paper 2 Answer Key 2025.
Why Look at Past Years’ Answer Keys?
Checking past answer keys like UPSC Prelims Answer Key 2021, 2022, 2023, and 2024 is a smart way to prep. It helps you:
- Find topics that keep showing up.
- Get a feel for how UPSC asks questions.
- Avoid messing up the same way twice.
Here’s where to find them:
| Year | GS Paper 1 Answer Key | CSAT Answer Key |
| 2024 | Download PDF (#) | Download PDF (#) |
| 2023 | Download PDF (#) | Download PDF (#) |
| 2022 | Download PDF (#) | Download PDF (#) |
| 2021 | Download PDF (#) | Download PDF (#) |
| 2020 | Download PDF (#) | Download PDF (#) |
Why the UPSC Prelims Answer Key 2025 Is a Big Deal
The UPSC Prelims Answer Key 2025 is super useful because it:
- Tells You Your Score: Shows if you’re likely to pass the cutoff for UPSC GS Answer Key 2025.
- Spots Your Mistakes: Points out what you got wrong so you can get better.
- Shows UPSC’s Style: Gives you a hint about how questions are getting more brainy.
- Helps You Study: Use the UPSC Prelims 2025 Question Paper and solutions to prep smarter.
FAQs About UPSC Prelims Answer Key 2025
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When’s the UPSC Prelims 2025 answer key coming out?
The official UPSC Answer Key 2025 will drop in April or May 2026, after the final results.
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How do I get the official answer key?
Head to upsc.gov.in, click “Examinations”, then “Answer Keys”, and download the UPSC Prelims Answer Key PDF.
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Where can I find unofficial answer keys?
Check Guru’s Ashram IAS website or X posts for UPSC Prelims 2025 Answer Key for GS Paper 1 and CSAT Paper 2.
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What’s the minimum score for CSAT?
You need 33% (66 marks) in CSAT Paper 2 to qualify for GS Paper 1 checking.
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How do I get the UPSC Prelims 2025 Question Paper?
The UPSC Prelims 2025 Question Paper and UPSC CSAT 2025 Question Paper (including Hindi versions) are on Guru’s Ashram IAS website or X.
Conclusion
The UPSC Prelims Answer Key 2025 is your best bet for checking how you did and planning your next steps. The official UPSC Answer Key 2025 is still a while away, but unofficial answer keys from Guru’s Ashram IAS let you check your UPSC Prelims 2025 GS Paper Answer Key and CSAT Answer Key 2025 right now. Use the marking scheme to figure out your score and look at the UPSC Prelims 2025 Question Paper to learn from your answers.
If you’re getting ready for future UPSC exams, don’t skip UPSC Prelims Answer Key 2021, 2022, 2023, and 2024. They’ll give you a sense of what UPSC loves to ask. Keep checking Guru’s Ashram IAS website for the latest UPSC 2025 Prelims Answer Key Paper 1, UPSC CSAT Paper 2 Answer Key Prelims, and UPSC Prelims Answer Key Set B or Set D PDFs. Good luck, and keep chasing those UPSC dreams!
