IMO, NSO & IEO Explained: A Parent's Guide to SOF Olympiads

If your child has come home with a school circular about an “Olympiad”, you are not alone in feeling a little lost. Between the IMO, NSO, IEO, IGKO and a dozen other abbreviations, it is hard to know what actually matters. This guide breaks it down in plain language.

What exactly is an Olympiad?

School Olympiads are competitive exams that test conceptual understanding and reasoning — not rote memorisation. They are taken alongside regular school studies, usually once a year, and rank students at the school, state, zonal and national level. The goal is to reward deep thinking and give strong students a national benchmark.

The most widely taken Olympiads in India are run by the Science Olympiad Foundation (SOF). Other reputable bodies include Silverzone, Unified Council, CREST and the HBCSE (which runs the senior, route-to- international Olympiads).

The main SOF Olympiads

• IMO — International Mathematics Olympiad. Tests mathematical reasoning, logic and problem-solving for Classes 1–12.
• NSO — National Science Olympiad. Covers science concepts, application and reasoning.
• IEO — International English Olympiad. Grammar, vocabulary, comprehension and everyday English.
• IGKO — International General Knowledge Olympiad. Current affairs, life skills and GK.
• ISSO & others. Social studies and subject-specific Olympiads round out the list.

How the two levels work

Most SOF Olympiads have two rounds. Level 1 is held in school and is open to all registered students. Students who clear the Level 1 cut-off (top performers, plus class and zone toppers) qualify for Level 2, a tougher national round. For Classes 1–2, there is usually only a single level.

Eligibility, fees and dates

Any student in Classes 1–12 can appear — you register through your school, which receives the forms from SOF. Registration windows typically open between July and September, with Level 1 exams held between November and January, depending on the subject. Because exact dates shift each year, always confirm against the official schedule.

We maintain a continuously updated calendar of registration windows and exam dates across all major boards on our Olympiad Dates page.

How should my child prepare?

1. Start with the official syllabus for your child’s class and subject.
2. Practise in the real exam pattern, including the Achievers section.
3. Review mistakes — understanding why an answer is wrong is where learning happens.
4. Sit at least one full timed mock exam before the real thing.

You don’t need expensive coaching to do this well. A structured set of pattern-aligned questions, a way to track weak topics, and consistent short practice sessions will take most students a very long way.