NSO 2025-26: Exam Pattern, Syllabus and Preparation Strategy

About the NSO

The National Science Olympiad (NSO) is conducted by the Science Olympiad Foundation for students in Classes 1–12. It is one of the most popular school olympiads in India, testing Physics, Chemistry, Biology, and logical reasoning through objective questions.

NSO scores are used by schools and coaching institutes as a benchmark for science aptitude. Top performers in Level 1 advance to Level 2, a national-level examination.

Exam pattern

Section breakdown

| Section | Grades 1–4 | Grades 5–12 | |---|---|---| | Logical Reasoning | 10 Qs | 15 Qs | | Science | 25 Qs | 35 Qs | | Achievers Section | 5 Qs | 10 Qs | | Total | 40 Qs | 60 Qs |

Duration: 60 minutes. The Achievers Section carries 2 marks per question (vs 1 mark for other sections in most grade categories).

Negative marking

NSO typically does not have negative marking for most grade levels. Confirm with your school before the exam, as SOF occasionally updates the marking scheme.

Grade-specific syllabus

The NSO follows the NCERT curriculum with olympiad-level depth. Key topics by grade group:

Classes 1–4: Plants and Animals, Food and Health, Air and Water, Human Body, Basic Science.

Classes 5–7: Matter, Living World, Motion, Heat, Light, Sound — introductory concepts with application-based questions.

Classes 8–10: Separation of Substances, Cells, Metals and Non-metals, Chemical Reactions, Light, Electricity, Heredity. These grades see the sharpest jump in difficulty.

Classes 11–12: Physics (Mechanics, Optics, Electrostatics), Chemistry (Organic, Inorganic, Physical), Biology (Cell Biology, Genetics, Ecology). Questions at this level require deep conceptual understanding, not surface recall.

Preparation strategy

Phase 1: Learn the exam structure (Week 1)

Before you study a single concept, take one full-length NSO mock test at your grade level. Time yourself. The goal is not a good score — it is to learn which section costs you the most marks and what types of questions appear in each section.

Phase 2: Subject-wise concept work (Weeks 2–5)

Work through your weak subjects chapter by chapter. For each chapter, follow this sequence:

1. Read the textbook concept
2. Solve 10 textbook problems
3. Solve 15 olympiad-style problems on that concept
4. Note the difference in what the question is actually asking

NSO questions on the same concept as textbook exercises are usually harder in one specific way: they add an extra step, require you to apply two concepts simultaneously, or introduce an unusual context (a real-world application rather than a lab setup).

Phase 3: Achievers Section focus (Week 6)

The Achievers Section is disproportionately important. In Grades 5–12, it is 10 questions carrying 2 marks each — that's 20 marks out of 80 total, or 25% of your score. Students who struggle in this section are giving away ranks.

Achievers questions are typically multi-concept: they require you to connect material from two or three different chapters. The best preparation is to keep a "connection log" as you study — whenever you notice a link between two concepts, write it down.

Phase 4: Full-length mocks (Weeks 7–8)

Run 2–3 full-length tests per week under strict timed conditions. After each test:

• Review every wrong answer before looking at the explanation
• Read the explanation even if you got the question right (the explanation often shows a faster method)
• Track which topic keeps appearing in your wrong answers

Physics, Chemistry, Biology — how to prioritise

For Classes 8–10, students often find Biology easiest (it rewards memorisation) and Physics hardest (it requires calculation under pressure). A common mistake is to over-invest in Biology for marks that are already secured, while ignoring Physics improvement that would yield more rank movement.

A rough guide: if your Physics score is below your school average, prioritise Physics. If it's above, the marginal return from further Physics study is low — shift time to Achievers Section practice.

One week before the exam

• Take one full-length mock 5 days before. Review it the next day.
• The 2 days before: light revision only. Re-read your connection log. Don't attempt new topics.
• The day before: rest. A tired brain misreads questions.