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NSEB / IBO

National Standard Examination in Biology → International Biology Olympiad

Olympiad 6 Info Sections
🌐 Official Website
📋 NSEB / IBO — Overview Overview

NSEB is Stage 1 of the International Biology Olympiad (IBO). Most popular among NEET aspirants — syllabus overlaps significantly.

Journey: NSEB → INBO → OCSC → PDC → IBO

🏆 5-Stage Selection Stages / Rounds
  1. NSEB: 300-500 selected.
  2. INBO: ~300 examinees, ~30-35 selected.
  3. OCSC: Theory & practicals at HBCSE. 4-6 selected.
  4. PDC → IBO: India sends 4 students.
📊 NSEB Exam Pattern Exam Pattern
ParameterDetails
Duration2 Hours
Marks216
Section I48 Single Correct (+3, −1)
Section II12 Multiple Correct (No negative)
🎯 NSEB 2022 Cut-offs Cut-off & Marks
  • MI Score: 112 / 216
  • MAS: 70
  • Avg Top 10: 140.1

Lowest cut-off among all NSEs.

📈 NSEB Chapter Analysis Chapter Analysis
Class 11 (76.67% — heavy bias!)
  • Biomolecules — 13.33%
  • Animal Kingdom (Chordates) — 8.33%
  • Animal Kingdom (Non-Chordates) — 8.33%
  • Neural Control — 6.67%
  • Photosynthesis — 6.67%
  • Anatomy of Flowering Plants — 5%
  • Body Fluids & Circulation — 5%
  • Excretory Products — 5%
Class 12 (23.33%)
  • Evolution — 6.67%
  • Human Health & Disease — 5%
  • Inheritance — 3.33%
  • Molecular Basis — 1.67%
💡 Preparation Tips Preparation Tips
  1. Class 11 = 76.67%: Focus heavily here.
  2. Biomolecules (13.33%): Top topic. Master beyond NCERT.
  3. Animal classification (16.67% combined): Both chordate & non-chordate phyla.
  4. Campbell Biology: Gold standard for Biology Olympiad.
  5. NEET overlap: NSEB prep directly helps NEET Bio.