Here's the mistake that breaks my heart every single year. A parent does everything right. Months of papers. A child who's worked hard and is genuinely ready. And then nobody registers them for the actual test. The deadline slipped past in June, quietly, while everyone was busy thinking about the September exam date instead.
There is no late entry for the 11+. None. Miss the registration window and your child waits twelve months for the next sitting, by which point the grammar school year group has moved on. So if you only read one thing about the 11+ this term, make it this.
Why registration trips so many parents up
Most families assume the exam date is the date that matters. It isn't. The exam usually lands in early to mid September, which feels comfortably far away when you're sitting there in May. But you have to register your child months before that. The registration window almost always opens and closes during the summer term, while school's still on and life is busy.
That gap between registering and sitting is where children fall through the cracks. You're thinking about the test in September. The system needs you in June. Those are two different deadlines, and only one of them gives you a second chance if you forget.
It catches out the organised parents most of all, oddly enough. They've got the prep sorted, the tutor booked, the calendar full of practice papers. The one admin task that actually unlocks the whole thing is the one that gets buried.
When does 11 plus registration open and close?
The honest answer is that it depends entirely on where you live, because there's no national system. Each county or consortium runs its own. But there's a pattern you can rely on.
Registration tends to open in late April or May. It closes somewhere between mid June and the end of July. The exam follows in September. So the rough rule is simple. If it's spring and your child is in Year 5, the window is either open now or about to open. Check this term, not next.
A few areas open earlier and a few stragglers later, but if you treat June as your danger month you'll rarely go wrong. Why June? Because that's when most of the big selective areas slam their windows shut.
Kent Test registration deadlines
Kent is the one I get asked about most, partly because the dates are so firm. For September 2026 entry the Kent Test registration opens on 1 June and closes at midnight on 1 July. You register through Kent County Council's website, not through the schools themselves.
That 1 July cut-off is hard. It's also the deadline for requesting access arrangements. So if your child needs extra time or any other accommodation, you can't leave it to the last minute. Register early, sort the paperwork, and don't assume the school will chase you. They won't.
Buckinghamshire and the opt-out trap
Bucks works differently, and the difference matters. If your child is in a Buckinghamshire state primary school, they're entered for the Secondary Transfer Test automatically. You don't register them in, you opt them out if you don't want them to sit it.
Sounds easier, doesn't it? It is, but only if you live in the county. If your child goes to a primary school outside Bucks and you want a Buckinghamshire grammar, you have to register manually. That deadline falls around the start of the summer term. Plenty of out-of-county families miss it because they assume the automatic system covers them too. It doesn't.
Essex, Berkshire and the rest
In Essex, the well-known grammars use the CSSE exam, and you register through the CSSE consortium directly rather than the local council. Their window opens in late spring and closes in the summer, and the test sits in the autumn alongside everyone else.
Berkshire, which is home turf for me near Reading, is more fragmented. The Slough consortium runs its own registration, and the Reading grammars handle their applications separately, often with a late June or early July deadline. If you're applying to more than one Berkshire school, you may be filling in more than one form with more than one date. Check each school individually. Don't assume one registration covers the lot.
Everywhere else follows the same shape. A council or consortium portal, a spring opening, a summer close. The names and exact dates change, the structure doesn't.
The bit everyone forgets: registration is not the school application
This trips up even careful parents. Registering for the 11+ test and applying for a secondary school place are two completely separate things, with two separate deadlines.
You register in the summer to sit the test. Then, after results come out in October, you complete your secondary school application through the normal national process, which closes on 31 October across England. So you've got two boxes to tick, months apart. Miss the October one and even a passing score won't get your child a place, because you never formally asked for one.
Write both dates somewhere you'll actually see them. The summer registration and the October application. They're a four-month relay, and dropping the baton at either end ends the race.
How to make sure you never miss it
Find your county or consortium's admissions page right now and read this year's timeline. Today, if you can. Most publish the exact dates by spring.
Then put two reminders in your phone. One a fortnight before the registration window opens, and one three days before it closes, because the close date is the one that actually bites. Belt and braces. It takes five minutes and removes the single most avoidable disaster in the whole process.
And if you're still deciding whether your child should even sit, register anyway while you mull it over. Registering doesn't commit you to anything. You can always pull out later. What you can't do is register late.
Frequently asked questions
What happens if I miss the 11 plus registration deadline? Your child doesn't sit the test that year. There's no late entry and no appeal for a missed registration, so the next opportunity is twelve months away. By then the grammar school intake year has changed, which is why missing it is so costly.
Do I register through the school or the council? It depends on your area. Kent and most counties run registration through the local authority's website. Essex uses the CSSE consortium. Some Berkshire schools take applications directly. Always check who runs your specific test before you assume.
My child is automatically entered in Buckinghamshire. Do I still need to do anything? If you're in a Bucks state primary, they're entered for you. But you should still confirm the details and check whether you need to opt out for any reason. Out-of-county families have to register manually and have their own earlier deadline.
Is registering for the test the same as applying for the school? No, and this catches people out. Registration in the summer lets your child sit the test. The secondary school application is a separate form through the national system, closing on 31 October. You need to do both.
If you're not yet sure whether your child is on track to make a registration worthwhile, that's exactly what ReadyFor11 is for. Run a free, honest assessment at readyfor11.co.uk and you'll know where they stand before the deadline forces your hand.