SOF ISSO vs SilverZone iSSO: which social science olympiad

Social science is the subject where the olympiad names are least helpful. SOF runs ISSO. SilverZone runs iSSO. One letter of case is the whole difference in the name, and almost nothing else about the two papers is the same — not the length, not the marking, not the way the syllabus is cut up, and not the month they are sat in. A third body, Indian Talent Olympiad, runs a social studies paper called NSSO on both a school route and a route a family can enter on its own. This post is the side-by-side, for Classes 6, 7 and 8, with every figure read off the body’s own surface on 29 September 2026.

If you only have a minute: SilverZone’s registration closes on 30 September 2026 and covers every paper it runs. SOF publishes no closing date at all, and its social science paper is not sat until 30 November at the earliest. Indian Talent Olympiad’s individual online route closes on 30 October. Those are three different kinds of date and they are explained below, because treating them as one list is how a family ends up chasing the wrong deadline.

When does registration close for each social science olympiad?

SilverZone publishes one registration date outright — 30 September 2026 — and it is the same date on every one of the 34 records its own exam-date endpoint returns, iSSO included. SOF publishes no date anywhere. What SOF publishes is a rule: "Schools may send registrations by 30 days before the chosen date of each exam." So a SOF ISSO cutoff is a subtraction, it is different for each of the two sittings, and it is only real once your school has chosen one. Indian Talent Olympiad publishes fixed dates on both its routes, and its school route has three of them.

How different are the two papers?

This is the part worth reading before you decide, because it changes how a child should revise. SilverZone iSSO spreads its marks evenly across the themes of the school book. SOF ISSO does not divide the subject at all until Class 9.

The two lines that matter most in that table are the two nobody looks at. SOF draws 30 per cent of the paper from last year’s book, and it uses this exact subject as its own worked example: "class-7 ISSO exam will have 70% questions from class-7 syllabus and 30% questions from class-6 syllabus." That is roughly fifteen of the fifty questions, and they all sit in the one-mark section, because SOF adds that Achievers questions come from the current class only. SilverZone publishes no such rule, so its paper is this year’s book as far as anybody can tell from what the body has put in writing.

The other is the even weighting. On SilverZone’s Class 6 and Class 7 papers, history, geography, civics and economics carry 15 marks each — no theme can be skipped and none is worth cramming over another. On SOF’s, they are not separated at all, so there is no weighting to plan around and no way to tell in advance whether a paper will lean historical or economic. A child who is strong in one half of the subject and weak in the other is better served by the paper that tells you where the marks are.

Does the published syllabus match my child’s school book?

Both bodies publish a topic list per class. We mapped each of them onto the 2026-27 NCERT book, Exploring Society: India and Beyond, chapter by chapter — and the result is not symmetric.

• SilverZone iSSO, Class 6: every one of the book’s fourteen chapters appears on SilverZone’s list, in the book’s own order, under the book’s own five themes. Revising the school book is revising for the paper, for 75 of the 100 marks.
• SOF ISSO, Class 6: twelve topic names against fourteen chapters. Six are a chapter title word for word, three are a clear shortening of one, two are the same subject in older wording. Two chapters — India, That Is Bharat, and The Value of Work — carry no SOF name at all.
• SOF ISSO, Class 7: fourteen names against a twenty-chapter book, but this one is compression rather than omission. Five of SOF’s names each cover two chapters at once, and worked through, the list reaches nineteen of the twenty. Exactly one chapter, India: A Home to Many, carries no SOF name.
• SOF ISSO, Class 8: ten names against fifteen chapters, and this is the widest gap of the three. Six chapters carry no SOF name on any reading — World Geography, Indian Architecture, the Judiciary, Citizenship, Dynamics of Population and India’s Urban Landscape.

There is one more thing on SOF’s own site a parent will find and should discount. Its ISSO overview page describes the syllabus as covering "forest, gender, religion and caste, money and credit, and print culture." Those are Class 10 topics, and not one of them appears on the Class 6, 7 or 8 list SOF publishes. It reads like boilerplate that was written once for the paper as a whole. Use the class syllabus page, not the overview.

What if the school runs neither?

Then social science is the hardest of the five subjects to arrange, and it is worth knowing why before you spend an evening on it. SOF has no individual route for any paper it runs — its own words are "Students cannot submit their applications individually. Applications will only be submitted via the schools." SilverZone’s default is the school too, and although it operates a public individual form at r.silverzone.org, we have not been able to confirm which papers that form covers, so ask before relying on it.

Indian Talent Olympiad’s individual online route is the one that is confirmed to take a family directly for this subject. NSSO is one of the six papers on that route, for Classes 1 to 10, at ₹500 per subject, sat from home in a window rather than at school. Slot 1 is 7 December 2026 with registration closing 30 October 2026; slot 2 is 5 January 2027 and has no published cutoff. Indian Talent Olympiad marks those dates tentative and says the final schedule is updated 20 days before the exam. Of the other three bodies this site tracks, CREST, Unified Council and Humming Bird publish no social science paper at any class, so there is nothing there to ask for.

Before you take the paid individual route, try the school once more. SOF charges a school nothing to register as an exam centre, and ₹170 per student per olympiad including GST, with the school allowed to add up to ₹30. A coordinator who has not run ISSO before is being asked for administration, not for money, and that is a different conversation from the one most parents open with.

How do I choose between them?

If the school has already entered one of them, sit that one — the choice is generally the school’s, and a child gains more from sitting a paper than from holding out for the better-matched one. If both are on offer, the deciding question is whether your child is even across the subject or strong in parts of it: SOF ISSO rewards breadth, because 45 of its 50 questions are worth one mark each; SilverZone iSSO rewards knowing where the marks are, because its themes are weighted equally and published. Five practical cuts:

• Ask the coordinator which paper, if any, the school has already entered, and on which date. That single answer settles most of this.
• A child who is even across history, geography, civics and economics is better suited to SOF ISSO. A child who is strong in some of those and weak in others is better suited to SilverZone iSSO, because its weighting is published and even.
• If your child is in Class 7 or 8 and last year’s book has gone back to the school, that is an argument for SilverZone: SOF’s stated 30 per cent from the previous class is real, and it is a third of the paper.
• If nothing is on offer at school, Indian Talent Olympiad’s individual online NSSO is the route that is confirmed open, and its slot 1 cutoff is 30 October 2026.
• A child can sit more than one. They are different bodies with different papers on different days, and at Classes 6 to 8 all three are drawn from the same NCERT book, so the revision overlaps almost entirely.

What could you not confirm?

Four things, and they are listed rather than left out because a gap a parent can see is worth more than a page that reads as complete. None of them is a gap in the schedules; each is something the body itself has not published.

• Whether SilverZone’s individual registration form at r.silverzone.org offers iSSO. Its own page calls the form "for individual registrations only. This is not a school registration link", but does not list the papers. Ask SilverZone.
• Whether SOF ISSO carries negative marking. SOF publishes a marks-awarded scheme and states no penalty, which is an absence rather than a stated no. The instruction sheet on the official sample paper is the place to check.
• Whether SilverZone iSSO has a level structure. Its iOM, iOS and iOEL pages describe a Level 2 and iOEL a Level 3; its iSSO page describes none, and SilverZone does not say either way.
• What the previous-class expectation means at Class 6, where SOF’s 30 per cent rule points at a Class 5 course that is environmental studies rather than social science in most schools. SOF publishes no bridge list and no worked example for that class.

Every date and figure in this post was read off the issuing body’s own surface on 29 September 2026 — SOF at sofworld.org/exam-schedule, /isso, /isso/about-isso-exam/how-participate and the three class syllabus pages; SilverZone at its own exam-date endpoint; Indian Talent Olympiad at its offline and online schedule pages. The per-class detail, including the full chapter-by-chapter mapping for each paper, is on our exam guides below.