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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. Of the three routes due to close on 31 August 2026, only SOF’s actually did — SilverZone moved its cutoff to 30 September (and has since moved it again, to 31 October) and Indian Talent Olympiad extended Set A twice, to 10 September. Twelve of SOF’s thirteen sittings in Maths, Science, English, Hindi and Social Science were never on that clock at all, and some 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, OlympAIUpdated 14 October 20268 min read

Every date on this page was re-read from the issuing body's own site on 14 October 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.
Corrected 2 September 2026. When this went up on 29 August, three routes closed on 31 August. Two of them have since moved, both in the direction that gives you more time: SilverZone replaced its 31 August cutoff with 30 September 2026 on every one of its papers, and Indian Talent Olympiad extended Set A to 5 September 2026. Neither body announced it; both were found by re-reading their own schedule surfaces. Corrected again 5 September 2026: Indian Talent Olympiad has extended Set A a second time, to 10 September 2026 — the same move, on the same kind of morning, one deadline later. Corrected a third time 14 October 2026: both bodies moved again. SilverZone replaced 30 September with 31 October 2026, and Indian Talent Olympiad extended Set B from 10 October to 22 October 2026 — again with no announcement from either. The tables below are corrected. The point of the piece survives it intact — and, if anything, the correction is the point: a date you read a week ago is not a date you know today.

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 were due to close on 31 August 2026. Only one of them did. SOF closed one date of one paper — the 30 September English sitting — which leaves twelve of its thirteen sittings in our five subjects still ahead. SilverZone and Indian Talent Olympiad both moved their dates instead, and both moved them later.

The three routes that had a 31 August 2026 cutoff, and what each of them did. Read from each body’s own schedule surface on 29 August 2026 and re-read 2 and 5 September 2026.
BodyWhat 31 August wasWhere it stands now
SilverZoneEverything. One `Last Date of Registration` covering every paper on its schedule, every one of our five subjectsMoved twice — now 31 October 2026. The body replaced 31 August with 30 September on its own exam-date endpoint on 2 September, and 30 September with 31 October some time between our reads of 1 and 14 October, with no announcement anywhere on its site either time. *(Its schedule is published on a page SilverZone itself heads “Tentative” — that marker is the body’s, not ours, and this year it earned it.)*
Indian Talent OlympiadSet A — one of three. All five subjectsSet A extended twice — now 10 September 2026, ten days later than the date it replaced. Its schedule page reads “LAST DATE TO REGISTER – SET A Extended Till 10 th September, 2026”, having read 5 September until that morning and 31 August until 1 September. Behind it: Set B, extended from 10 October to 22 October · Set C, 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 itClosed, as published. The only one of the three that did. Twelve further sittings across the five subjects remain, 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”. It is also the only row where 31 August meant what it said — which is worth holding on to when you next see a countdown to somebody else’s date.

Did SOF’s deadline pass?

One of SOF’s thirteen sittings in our five subjects was 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, was on the 31 August clock. English is the only one of our five subjects that had anything on it at all, and even English keeps the two dates above after it: 27 September if the school picks 27 October, 18 October if it picks 17 November.

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 there is no parent sign-up at all, and for SilverZone the school is the default route, so the school’s answer is where the truth lives. SilverZone also runs an individual registration form at r.silverzone.org; which papers it offers, we have not been able to confirm.

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 for the subjects and the schools that are not already in.

Which olympiads can a parent register for without the school?

These 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. SilverZone also runs an individual registration form of its own at r.silverzone.org, alongside its school route, which stays the default; which papers that form offers we have not been able to confirm.

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 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:

  • For Hindi, the only direct route we have been able to confirm is 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. SilverZone sets a Hindi paper, but we have not confirmed that its individual form offers it.
  • For Social Studies, the only direct route we have been able to confirm is Indian Talent Olympiad’s online route. Humming Bird runs no social studies paper at all, and neither does CREST. SilverZone sets a social studies paper, but we have not confirmed that its individual form offers it.

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, 22 October (extended from 10 October)
Social ScienceSOF ISSO ×2 · ITO Sets B and CITO’s online route onlyITO Set B, 22 October (extended from 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 direct routes above are the answer, and SilverZone’s individual form is worth one question too. 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 cutoff is 22 October (extended from 10 October) and Set C’s 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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