IB ACIO 2025 Syllabus – Complete Subject-Wise Guide for Tier‑1 and Tier‑2

The Intelligence Bureau (IB) has launched the largest-ever recruitment drive for Assistant Central Intelligence Officers (ACIO) Grade‑II/Executive, with 3,717 vacancies and the selection process comprising:
Tier‑1 (Objective Test), Tier‑2 (Descriptive Paper), and Interview (Tier‑3).

A clear understanding of the IB ACIO 2025 syllabus is essential to crack this prestigious exam. Here’s a detailed breakdown:

Tier‑1: Objective (100 marks – 1 hour)

Tier‑1 includes five equally weighted sections (20 ques. / 20 marks each) — all MCQs with 0.25 negative marking.

SectionTopics Covered
Current AffairsNational/international news, government schemes, awards, geography, etc.
General StudiesHistory, Polity, India & World Geography, Economy, Science & Tech, GK
Quantitative AptitudeNumber systems, percentages, averages, ratio & proportion, profit & loss, time & work, discount, mensuration, algebra, statistics, more
Reasoning & Analytical AbilitySeating arrangements, coding‑decoding, puzzles, logical sequences, blood relations, syllogisms, input‑output, calendars, direction sense, etc.
English LanguageGrammar, vocabulary, reading comprehension, error correction, synonyms/antonyms, idioms & phrases

Tier‑2: Descriptive (50 marks – 1 hour)

Tier‑2 evaluates your writing and comprehension skills through an essay and English comprehension:

  • Essay Writing: ~250–300 words (20 marks)
  • English Comprehension & Precis: Read passage + answer questions or write precis (30 marks)

Tier‑3: Interview (100 marks)

Candidates shortlisted (≈10× vacancies) will undergo a personal interview and psychometric evaluation. Performance across all three stages determines the final merit list

Exam Pattern Summary

TierFormatDurationMarksNegative Marking
1MCQs (5 sections)60 min1000.25/q
2Descriptive Essay + Comprehension60 min50No
3Interview + Psychometric100No

Preparation Strategy

  1. Develop Mastery Over Sections: Create a section-wise timetable to cover each topic in Tier‑1 thoroughly.
  2. Stay Current: Read quality newspapers/apps, jot significant national & global updates.
  3. Practice Numeric & Logical Aptitude: Use mock tests and previous year papers for speed and accuracy.
  4. Enhance English Skills: Read, write essays, practice precis, review grammar, and take quizzes.
  5. Mock Tests: Time-bound Tier‑1 and Tier‑2 tests help identify areas of improvement.
  6. Interview Prep: Work on communication skills, current affairs, and IB-related knowledge.
  7. Revision: Regularly revisit notes, especially high-weightage topics and essay frameworks.

Key Takeaways

  • Tier‑1: Covers five sections — Current Affairs, Gen. Studies, Quant, Reasoning, English (100 MCQs in 1 hour with negative marking).
  • Tier‑2: Descriptive — Essay (20 marks) + Comprehension/Precis (30 marks).
  • Interview: 100 marks, assesses personality & psychometric suitability.
  • Vacancies: 3,717 positions; pay scale ₹44,900–₹1,42,400 (Level 7).

What’s Next?

  • Register Now: Apply via mha.gov.in before the deadline.
  • Download Syllabus PDF: Direct link and exam guidelines are on the official site & trusted education portals like Adda247, CareerPower, Oliveboard.
  • Start Preparation Immediately: With syllabus roadmap, mock tests, and interview prep—you’re set to crack all three stages.

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