UPSC Prelims Answer Key 2026

The UPSC Prelims Answer Key 2026 is a document listing correct answers for all questions in the Civil Services Preliminary Examination held on 24 May 2026. It covers GS Paper 1 (100 questions, 200 marks) and CSAT Paper 2 (80 questions, 200 marks). Candidates use it to estimate their expected score, analyse subject-wise performance, and decide whether to begin Mains preparation before official results are declared.

Starting 2026, UPSC introduced a major reform, a provisional official answer key is now released on upsc.gov.in shortly after the exam, replacing the earlier practice of publishing it only after final results. The Unacademy unofficial answer key is available the same day, within hours of each paper. Candidates can also challenge disputed answers via UPSC's QPRep portal before 31 May 2026, 6 PM. The final official key is published after the full recruitment cycle ends.

Follow these steps to download the UPSC Prelims Answer Key 2026 PDF:

• Visit Unacademy’s UPSC Prelims Answer Key 2026 page.
• Select your paper, GS Paper 1 or CSAT Paper 2.
• Choose your question booklet set- A, B, C, or D.
• Click the Download PDF link.

UPSC prints the same 100 questions in four different orders- Sets A, B, C, and D, to prevent copying during the exam. The questions, correct answers, and marking scheme are identical across all sets; only the question sequence differs. Always download the set-wise answer key that matches the set code printed on the top of your question booklet. Using the wrong set will give you an incorrect score estimate.

Unacademy’s UPSC Prelims GS Paper 1 Answer Key 2026 provides correct answers for all 100 MCQs with subject-wise explanations citing NCERT sources, government reports, and statutory texts. Each answer flags contested options where coaching institutes disagree and clearly explains the logic behind the correct choice. This helps candidates not just calculate their score but identify conceptual gaps, an essential input before starting Mains preparation.

The UPSC Prelims CSAT Answer Key 2026 (Paper 2) is published on Unacademy’s answer key page after the afternoon shift (2:30 PM-4:30 PM). It covers all 80 CSAT questions across reading comprehension, logical reasoning, analytical ability, decision-making, and basic numeracy. The answer key includes a score calculator to check whether you have crossed the mandatory qualifying threshold of 33% (66 marks out of 200) required to be eligible for the Mains merit list.

The UPSC Prelims question paper with answer key available on Unacademy contains: the full question paper for GS Paper 1 and CSAT, the correct answer for every question, subject and topic tags per question, detailed explanations citing source material, a subject-wise distribution table, and a marks calculator. Together, this gives candidates a complete post-exam analysis toolkit in a single resource, no need to visit multiple sites.

Yes. Unacademy’s answer key is prepared by experienced IAS educators and subject experts who cross-reference standard NCERT textbooks, government reports, and official UPSC sources. For questions where different coaching institutes provide conflicting answers, contested options are clearly flagged. The answer key is updated within 48 hours as consensus emerges across leading UPSC institutes, ensuring maximum accuracy well before the official provisional key is published.

Use these formulas based on UPSC’s official marking scheme:

• GS Paper 1: Score = (Correct Answers × 2) − (Wrong Answers × 0.667)
• CSAT Paper 2: Score = (Correct Answers × 2.5) − (Wrong Answers × 0.833)

Unattempted questions carry zero marks. Example: 58 correct + 12 wrong in GS Paper 1 = (58 × 2) − (12 × 0.667) = 116 − 8 = 108 marks. Use Unacademy’s built-in UPSC marks calculator on this page to compute your score automatically.

Paper	Questions	Total Marks	Correct	Wrong	Unattempted
GS Paper 1	100	200	+2	−0.667	0
CSAT Paper 2	80	200	+2.5	−0.833	0

Both papers are conducted in offline OMR mode. GS Paper 1 determines the Prelims merit cutoff. CSAT is qualifying only, marks are not added to the final score. Negative marking of ⅓ of the question's marks applies to every wrong answer.

Under UPSC’s new 2026 transparency reform, candidates can challenge answers via the QPRep (Question Paper Representation) Portal on upsc.gov.in.

• Log in using your UPSC registration credentials.
• Navigate to QPRep → Civil Services Preliminary Exam 2026.
• Select the question number you wish to challenge.
• Upload documentary evidence (NCERT, government source, etc.).
• Submit before 31 May 2026, 6 PM. Late submissions are not accepted.

UPSC reviews all objections, and if upheld, the answer key is revised before the final result.

Yes. Unacademy maintains a comprehensive year-wise UPSC Prelims answer key archive covering GS Paper 1 and CSAT for all years from 2023 to 2026. Each year includes set-wise PDFs, subject-wise breakdowns, and detailed explanations. Studying year-wise answer keys alongside question papers helps aspirants track how UPSC has shifted question difficulty, changed subject weightage, and moved from fact-based to application-based questions over the years, essential intelligence for any serious aspirant.

Take this action based on your score:

• Score well above cutoff: Start Mains preparation immediately, don’t wait for official results. Enroll in Unacademy’s UPSC Mains programme and begin GS Paper 1 and Essay writing.
• Score borderline (±5 marks of estimated cutoff): Begin Mains prep in parallel while monitoring the official result.
• Score below cutoff: Do a subject-wise gap analysis using the answer key explanations. Identify which subjects cost the most marks and redesign your study plan for the next attempt.

After analysing your answer key, start structured online preparation on Unacademy in 6 steps:

• Identify weak subjects from your question-by-question analysis.
• Access free subject-wise video lectures on Unacademy for those topics.
• Complete NCERT foundation using Unacademy’s NCERT-mapped courses.
• Enroll in a structured Prelims + Mains coaching programme.
• Follow daily current affairs using Unacademy’s topic-tagged briefs.
• Take weekly full-length mock tests to track improvement.

Unacademy is one of India’s largest UPSC coaching platforms, trusted by lakhs of aspirants.

• Faculty: IAS toppers, ex-IAS/IPS officers, and India’s most-viewed UPSC educators.
• Coverage: Complete Prelims + Mains + Interview in English and Hindi.
• Mock Tests: Full-length and subject-wise tests with detailed analytics.
• Free Content: Thousands of hours of live classes, current affairs, and study materials.
• Flexibility: Learn live, recorded, or download offline.

UPSC Prelims 2026 GS Paper 1 was widely assessed as moderate to difficult, with a heavier emphasis on history and analytical reasoning compared to 2024-2025. The paper rewarded aspirants with strong conceptual preparation, current affairs integration, and effective time management. CSAT 2026 was similarly challenging. The key shift: UPSC is steadily moving from straightforward recall questions toward application-based, multi-statement, and elimination-style questions, a trend that has accelerated since 2021.

Candidates can submit objections to the UPSC Prelims 2026 provisional answer key through the QPRep portal on upsc.gov.in until 31 May 2026, 6:00 PM. Objections submitted after this deadline will not be considered under any circumstances. Each objection must be supported by evidence from an authentic, credible source such as an NCERT textbook, government report, or official website. UPSC’s expert committee reviews all valid objections and may revise the answer key before declaring the result.

The answer key is one of the most underused Mains preparation tools. Here's how to use it strategically:

• Wrong answers: For every question you got wrong, read the explanation fully, each incorrect answer reveals a conceptual gap that could appear as a Mains GS question.
• Subject-wise analysis: Topics where you attempted the fewest questions correctly are your Mains weak spots, prioritise them immediately.
• Trending topics: Questions asked in Prelims consistently reappear in Mains in essay or analytical format. Build your Mains notes around 2026 Prelims themes.