SOF vs Silverzone vs Unified Council: what’s the difference?

If your child’s school sends home olympiad forms, they almost certainly come from one of three organisers: the Science Olympiad Foundation (SOF), Silverzone or Unified Council. Their olympiads look similar from the outside. All three set objective papers based on the school syllabus, all three are written in schools, and all three give ranks, certificates and awards.

The differences are in the detail: which subjects they cover, which classes can take part, whether there is a second level, and how you register. This guide sets those out side by side, using each organiser’s own website. It doesn’t rank them, because the right one for your child depends on your school and your child, not on a league table.

Formats and dates change from year to year, so treat this as a map and check the organiser’s site before you register. Ado is not affiliated with any of these organisers.

The organisers

Science Olympiad Foundation (SOF)

SOF describes itself as an educational organisation set up by academicians, scientists and media personalities to promote academic competition among school students, and it has been running olympiads for nearly three decades. Its registered office is in New Delhi and its operational office in Gurugram. Website: sofworld.org.

Silverzone

The SilverZone Foundation is a registered trust and educational organisation headquartered in New Delhi. It runs olympiads and talent search exams for school students in India and abroad. Website: silverzone.org.

Unified Council

Unified Council describes itself as a professionally managed organisation in the field of education, established in 1998 and based in Hyderabad. It presents its exams as diagnostic tests meant to show a student’s strengths and gaps, not only to rank them. Website: unifiedcouncil.com.

Which olympiads each one runs

SOF

SOF runs eight olympiads:

• International Mathematics Olympiad (SOF IMO): Classes 1 to 12.
• International Science Olympiad (SOF ISO): Classes 1 to 12. This was long known as the National Science Olympiad (NSO), and many families still call it that.
• International English Olympiad (SOF IEO): Classes 1 to 12.
• International General Knowledge Olympiad (SOF IGKO): Classes 1 to 10.
• International Computer Science Olympiad (SOF ICSO): Classes 1 to 10.
• International Social Studies Olympiad (SOF ISSO): Classes 3 to 10.
• International Hindi Olympiad (SOF IHO): Classes 3 to 10.
• International Commerce Olympiad (SOF ICO): Classes 11 and 12, run in partnership with the Institute of Company Secretaries of India.

Silverzone

Silverzone runs a wider spread of subjects, including:

• International Olympiad of Mathematics (iOM)
• International Olympiad of Science (iOS)
• International Olympiad of English Language (iOEL)
• International Informatics Olympiad (iIO), its computer science olympiad
• SKGKO, its general knowledge olympiad
• International Reasoning and Mental Ability Olympiad (iRAO)
• International Social Studies Olympiad (iSSO)
• Akhil Bharatiya Hindi Olympiad (ABHO)
• International Talent Hunt Olympiad (iTHO)
• newer STEM and AI olympiads, and a commerce olympiad run with the Institute of Company Secretaries of India

The maths, science and English olympiads run from Class 1 to Class 12. Several of the others are for Classes 1 to 10. Check the page for each one.

Unified Council

Unified Council runs a smaller set, all ending at Class 10:

• National Level Science Talent Search Examination (NSTSE): Classes 1 to 10. Despite the name, it covers maths and critical thinking as well as science.
• Unified International Mathematics Olympiad (UIMO): Classes 1 to 10.
• Unified International English Olympiad (UIEO): Classes 1 to 10.
• Unified International General Knowledge Olympiad (UIGKO): Classes 1 to 10.
• Unified Cyber Olympiad (UCO): Classes 2 to 10.

Levels and format

SOF. The first level is written in school during school hours, in English, as a 60-minute objective paper: 35 questions for Classes 1 to 4 and 50 questions for Classes 5 to 12. The maths, science and English olympiads have a second level for qualifiers in Classes 3 to 12, decided by a mix of overall, zonal and school ranks. SOF’s schedule usually places the second level in February. Its GK, computer science, social studies, Hindi and commerce olympiads are single-level. The maths paper, for example, has sections on logical reasoning, mathematical reasoning, everyday mathematics and an “achievers” section of harder questions.

Silverzone. The first level is an objective paper whose length grows with the class, from 40 minutes for younger classes to 50 minutes for older ones. The maths, science and English olympiads have a second level for top first-level rank holders in Classes 3 to 12 who also score at least half marks; there is no second level for Classes 1 and 2. Silverzone notes that the top three ranks in these subjects are decided at the second level.

Unified Council. Its exams are single papers: objective questions, no negative marking, one hour. NSTSE, for example, has 40 questions for Class 1, 50 for Class 2 and 60 for Classes 3 to 10. For NSTSE, students can opt for a detailed Student Performance Report showing their chosen answers, the correct answers, subject-wise marks and where they stand.

How you register

• SOF: through schools. A school registers as an exam centre and sends in its students’ details; individual registrations are not accepted for at least some SOF olympiads.
• Silverzone: mainly through schools, which receive its prospectus and registration forms.
• Unified Council: mainly through schools, with the paper written in school. NSTSE also accepts individual registrations for an online sitting, and the site lists online sittings for some other exams too. Check each exam’s page for the current options.

If your child’s school doesn’t take part in a particular olympiad, ask the school first; it may be able to register as a centre.

Side by side

What they have in common

• School syllabus with a twist. All three base their questions on what is taught in school, with reasoning and application questions added. SOF, for example, says it follows the CBSE, ICSE and state board syllabi.
• Objective questions. Multiple choice throughout, so preparation is about accuracy and speed as much as understanding.
• Wide participation. Large numbers of schools take part, which is why ranks are reported by class, zone and overall.

What none of them is

None of these three is part of India’s national olympiad programme, the pathway that selects teams for the International Mathematical Olympiad or the International Junior Science Olympiad. That pathway starts with IOQM for maths and the National Standard Examinations for science. The word “International” in an olympiad’s name refers to who can take part, not to selection for an Indian team. For the national route, read the road to the IMO and the junior science olympiad pathway.

Choosing between them

Rather than asking which organiser is better, ask:

1. Which ones does my child’s school offer? This usually settles most of the choice.
2. Which subjects does my child enjoy? Pick the paper that matches, whoever runs it.
3. Does a second level matter to us? If your child likes a challenge, the second-level rounds give one.
4. How useful is the report? A clear breakdown of mistakes is worth more than a rank.
5. How many papers fall in the same term? One or two is usually plenty.

For subject-wise preparation, see our pages on SOF IMO, SOF’s science olympiad and NSTSE, and for help deciding how many to take, read which olympiad should my child take?