UPSC Prelims 2025 Answer Key (unofficial) has been released by Testbook! The UPSC Prelims 2025 was conducted on 25 May, 2025 in two sessions - GS Paper 1 (9:30 to 11:30 AM) and CSAT (2:30 to 4:30 PM). While the official UPSC Prelims 2025 Answer Key will be released by the Union Public Service Commission after the UPSC Mains and Interview/Personality Test has concluded, tentatively in June-July, 2026. Meanwhile, candidates can check the set wise unofficial UPSC Prelims Answer Key 2025 released by Testbook to cross verify their performance. 

Previously, the UPSC CSE Prelims 2024 Answer Key was OUT! The Union Public Service Commission released the official UPSC Prelims 2024 Answer Key on 21 May, 2025 for the UPSC Civil Services Prelims Exam conducted on 24 May, 2024. The UPSC Answer Key 2024 is released seprately for both papers, that is, GS Paper 1 and GS Paper 2 (CSAT). A total of 3 questions were dropped from GS Paper 1, while no questions are dropped in the CSAT as per the official UPSC Prelims Answer Key 2024. Candidates can download the official Answer Key from the official website of UPSC @upsc.gov.in. The Answer Key is an important document using which the candidates can tally their responses with the correct answers used by the Union Public Service Commission in cumulating the final score of UPSC Prelims.

Also check - UPSC Prelims Exam Analysis!

UPSC Prelims 2025 Answer Key 2025 [Unofficial]

The UPSC Prelims 2025 Answer Key will be released after the complete exam cycle for Civil Services Examination 2025 is over. In the interim, candidates can download the set wise unofficial UPSC Prelims Answer Key 2025 released by Testbook. The UPSC CSE Prelims 2025 has concluded on 25th May, 2025 for both GS Paper 1 and the CSAT. UPSC Prelims GS Paper 1 Answer Key and CSAT Answer Key is provided below for your reference - 

Download UPSC Prelims 2025 Answer Key [GS Paper 1, SET D]
Download UPSC CSAT 2025 Answer Key PDF [SET A]

UPSC Prelims Answer Key 2024 [Official]

The UPSC Prelims Answer Key was released by the Union Public Service Commission on 21 May, 2025. Candidates who had appeared for the Civil Services Examination 2024 must download the official Prelims 2024 Answer Key for GS Paper 1 and CSAT to cross-verify their responses with the correct answers. 

Download UPSC Answer Key 2024 for GS Paper 1 PDF

Download UPSC Answer Key 2024 for CSAT PDF

Watch UPSC Answer Key 2024 Expert Analysis

UPSC Answer Key PDF 2024 With Solutions

The UPSC Answer Key released by Testbook includes the Solutions for the UPSC Prelims GS 1 & CSAT Paper. Downloading and checking this answer key will allow the candidates to analyse their performance in both the GS 1 & CSAT Papers. Have a look at the IAS Prelims Answer key in the below section. 

Candidates can download the unofficial IAS Prelims Answer Key PDF from the table below.

The Commission has released the UPSC answer key for IAS Exam 2024 on the website after the successful declaration of the UPSC Result. The UPSC Prelims 2025 Answer Key (official) will be released after the final result declaration for the 2025 cycle. Applicants who have appeared in the IAS Prelims Exams can easily check their performance by going through the official UPSC Answer Key. Here are some important steps of instructions that an aspirant needs to follow in order to download the UPSC Prelims Answer Key pdf:

Step 1: Go to the official website of UPSC.

Step 2: On the top, there is the ‘examination’ tab. Click on that tab.

Step 3: A drop-down list will appear. ‘Answer key’ option will appear.

Step 4: Click on the ‘answer key’ link.

Step 5: A fresh page will open having the UPSC answer key for each year and each examination, Search for the UPSC CSE prelims examination.

Step 6: Select your respective set of papers from Set A, B, C, D

Step 7: Check the set-wise answer key and review your answers.

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

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

How To Calculate Marks with UPSC Prelims Answer Key?

After the release of the answer key, IAS aspirants can immediately download the UPSC IAS answer key from the website. Through this answer key, the candidates can calculate their scores. If wondering how to do that, follow the instructions below.

• Follow the required steps to download the UPSC answer key from the website.
•  Check the answer you marked with the correct answers provided in the answer key.
• Write down the number of correct and incorrect answers.
• With the help of the marking scheme and formula below calculate the IAS scores.

Check out UPSC CSAT Subject Wise Questions Weightage with Previous Year Trends from here.

Marking scheme:

• For each correct answer: +2 marks
• For each incorrect answer: -2/3 marks

Formula to Calculate IAS Scores

• Total marks of IAS = (Number of correct answers X 2 marks ) – (Number of incorrect answers X 2/3 marks)

Enroll for UPSC CSE Online Coaching here!

How to Challenge UPSC Answer Key?

Candidates can challenge the UPSC Provisional Answer Key only. Responses mentioned in the answer key can be challenged online within the deadline specified by the authorities. After considering these objections, the final answer key will be released.

Download IAS exam Previous Year Papers to boost your exam preparation!

hank you very much for reading our article.We hope you got all the relevant information about the UPSC Prelims Answer key . If you have any questions on the UPSC IAS PRELIMS Answer key, you can raise them in the comment section. For the preparation of various such Govt job exams, download Testbook App that can help you with its wide range of study material, online live classes, mock test series, exam-oriented courses, notes, etc.

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