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The registration deadline has passed — can my child still sit an olympiad?

A closed olympiad deadline is almost never the season closing. Twelve of SOF’s thirteen sittings in Maths, Science, English, Hindi and Social Science are not on the 31 August clock at all, Indian Talent Olympiad closes one set of three, and four bodies take a registration straight from a family. Here is what is still open, subject by subject, with the date each route closes on.

Puja RaniCo-Founder & CEO, OlympAI8 min read

Every date on this page was re-read from the issuing body's own site on 29 August 2026.

Every year, in the first week of September, the same message goes round the parent groups. Somebody’s child was not entered. The form went out in July, or it went to a class group they are not in, or the school runs two of the papers and not the one they had in mind — and they have just found out, three days after the date on every countdown.

If that is you, or you are looking at 31 August wondering whether it is the last date of the season, the useful thing to know is this: the date on the countdown is one body’s date, or one date of one paper. It is almost never the season’s.

This page is written around dates rather than around the day you read it. Every row names the date it closes on, so it says the same true thing before 31 August and after it — and the note under the title tells you when each of those dates was last read off the body’s own site.

I taught in schools before I started building OlympAI, and the honest reason this confusion happens is that we — everyone writing about olympiads, us included — run countdowns to single dates. Run enough of them and a parent reading three of our thirty messages comes away with one impression: that the olympiad season had a deadline and it has gone. That impression is false. Here is what is actually true, body by body, with each body’s own published dates.

Which olympiad registration deadlines have actually passed?

Three registration routes close on 31 August 2026, and they close very different amounts. SilverZone closes everything it runs, Indian Talent Olympiad closes the first of its three sets, and SOF closes one date of one paper — which leaves twelve of its thirteen sittings in our five subjects still ahead.

The three routes with a 31 August 2026 cutoff. Read from each body’s own schedule surface on 29 August 2026.
BodyWhat closes on 31 August 2026What that leaves
SilverZoneEverything. One `Last Date of Registration` covering all 17 of its papers, every one of our five subjectsNothing further published for 2026-27. This is the one body that genuinely shuts. *(Its schedule is published on a page SilverZone itself heads “Tentative” — that marker is the body’s, not ours, and it travels with the date.)*
Indian Talent OlympiadSet A — one of three. All five subjectsSet B, registration closing 10 October · Set C, closing 10 November · and a separate individual online route closing 30 October that needs no school at all
SOFOne date of one paper — the 30 September English sitting, and only for the schools that chose itTwelve further sittings across the five subjects, the earliest of them closing 23 September

The SOF row is the one that matters most, because SOF is the body most families mean when they say “the olympiad”.

Did SOF’s deadline pass?

One of SOF’s thirteen sittings in our five subjects is on the 31 August clock. The other twelve were never on it. SOF publishes no deadline table at all — registration reaches SOF 30 days before whichever date the school picks, so there are as many cutoffs as there are sittings.

That rule is the whole answer, and it is worth reading twice, because it means a SOF “deadline” is never a single date. It is a subtraction someone does after the school chooses.

SOF sittings in our five subjects. Every date in the right-hand column is derived from SOF’s own 30-day rule and applies only if the school picks the sitting beside it. Dates read from sofworld.org on 29 August 2026.
SubjectSOF paperSittings still aheadRegistration reaches SOF by
MathsIMO23 Oct · 26 Nov · 10 Dec 202623 Sep · 27 Oct · 10 Nov
ScienceISO *(the paper formerly called NSO)*30 Oct · 19 Nov · 3 Dec 202630 Sep · 20 Oct · 3 Nov
EnglishIEO27 Oct · 17 Nov 202627 Sep · 18 Oct
HindiIHO23 Nov 2026 · 22 Jan 202724 Oct · 23 Dec
Social ScienceISSO30 Nov 2026 · 19 Jan 202731 Oct · 20 Dec

English is the row to read twice, because it is the one that started this: SOF runs a third IEO sitting on 30 September, and 30 days before it is 31 August — so that one sitting, and only that one, is on Monday’s clock. English is the only one of our five subjects with anything on it at all, and even English keeps the two dates above after it.

My child’s school did not enter them. Is that fixable?

Sometimes, and the first move is the same either way: ask the coordinator which papers and which dates the school has chosen. For SOF and SilverZone there is no parent sign-up at all, so the school’s answer is the only place the truth lives.

Two things worth knowing before you ask.

The school’s own date is earlier than the body’s, and nobody publishes it. Somebody in that building has to collect names, match them to subjects, take the fees and send one list. Anything that needs thirty families to respond takes a week of chasing. So the school’s internal cut-off sits somewhere before the body’s, and I have never seen one published anywhere a parent could find it.

And one constraint that catches people out at Indian Talent Olympiad: a school chooses one slot per subject, and once it is finalised it cannot be changed. So if your school entered maths in Set A, Set B is not a second attempt at maths for that school. Sets B and C are open to the subjects and the schools that are not already in.

Which olympiads can a parent register for without the school?

Four bodies take a registration directly from a family: CREST, Indian Talent Olympiad’s individual online route, Unified Council’s online papers, and Humming Bird. None of them requires a school, a coordinator, or a decision anyone else has made.

Read from each body’s own registration surface on 29 August 2026. “No published closing date” means exactly that — the body has not published one, not that it will stay open indefinitely.
BodySubjects it runs directlyRegistrationExam dates
CRESTMaths, Science, EnglishOpen now, no published closing dateMaths 10 or 19 Dec · Science 3 or 12 Dec · English 1 or 5 Dec 2026
Indian Talent Olympiad *(individual online route)*Maths, Science, English, Social Studies *(and General Knowledge, Computer)*Closes 30 October 2026Slot 1, 1–7 December 2026 · slot 2, 4–9 January 2027
Unified Council *(online route)*Maths, English, and NSTSENo published closing date; ₹354 including GSTUIEO 3 Jan · UIMO 10 Jan · NSTSE 24 Jan 2027
Humming BirdMaths, Science, English, HindiOpen, no published closing date; ₹150 a paperMaths 18 Nov or 2 Dec · Science 19 Nov or 3 Dec · English 23 Nov or 7 Dec · Hindi 28 Nov or 11 Dec 2026

No single one of those four covers all five subjects, and the two widest cover a different four each. That sounds like a technicality and it is the most useful sentence in this post:

  • Hindi has exactly one direct route: Humming Bird. CREST runs no Hindi paper. Unified Council’s direct papers are Maths, English and NSTSE. Indian Talent Olympiad’s online route runs six papers and its Hindi paper is not one of them.
  • Social Studies has exactly one direct route: Indian Talent Olympiad’s online route. Humming Bird runs no social studies paper at all, and neither does CREST.

So the two subjects with the fewest doors have one each, and they are different bodies. If your child’s subject is Hindi or Social Science, that is the single fact to take away from this page.

So what can my child still sit, subject by subject?

Every one of our five subjects still has at least one route open after 31 August, and every one of them has a route that does not need the school at all. This is the table to check against your own situation.

SOF’s “earliest” dates are conditional on which sitting the school picks; the Indian Talent Olympiad dates are published and fixed.
SubjectThrough the schoolWithout the schoolEarliest thing that closes
MathsSOF IMO ×3 · Indian Talent Olympiad Sets B and CCREST · ITO online · Unified Council UIMO · Humming BirdSOF’s 23 September, if the school picked the 23 October sitting
ScienceSOF ISO ×3 · ITO Sets B and CCREST · ITO online · Unified Council NSTSE · Humming BirdSOF’s 30 September, same condition
EnglishSOF IEO ×2 · ITO Sets B and CCREST · ITO online · Unified Council UIEO · Humming BirdSOF’s 27 September, same condition
HindiSOF IHO ×2 · ITO Sets B and CHumming Bird onlyITO Set B, 10 October
Social ScienceSOF ISSO ×2 · ITO Sets B and CITO’s online route onlyITO Set B, 10 October

What should I actually do this week?

Send one message to the school coordinator, and give the answer a week to arrive. The question that gets a useful reply is not “did we miss it” — it is “which papers has my child been entered for, and on which dates?”

If the answer is yes, you are done, and you can stop reading deadline posts. If the answer is no, you now have a list above with a date on every row, and the earliest of those dates is 23 September — SOF’s cutoff for a 23 October maths sitting, and only if that is the sitting your school picked.

And if the answer is that your school runs none of this, the four direct routes are the whole answer. CREST has published no closing date at all, and Indian Talent Olympiad’s individual online route runs to 30 October.

There is a third answer, which is that you decide to sit this year out. That is a real option and I would not think less of it. A missed form says nothing about whether a child was ready.

What on this page expires, and when: SOF’s earliest derived cutoff passes on 23 September, the subject table starts losing rows from 27 September, Indian Talent Olympiad’s Set B closes on 10 October and Set C on 10 November. Every row names its own date, so you can see for yourself which half of this page still applies on the day you are reading it.
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