This is the decision at the head of everything else. Before question types, before tutoring, before school visits, a family with one child and secondary ambitions faces a fork: aim for entry at 11, or at 13? The two roads have different exams, different timelines, different costs, and — crucially — different schools at the end of them.

It is also a decision where advice is rarely neutral. Prep schools have an interest in children staying to 13. Tutors have an interest in whichever campaign they serve. This article has no route to sell you. The honest position is that neither entry point is better in general — each is better for particular children, particular local options, and particular target schools. What follows is the framework for working out which is which for yours.

First, what the two routes actually are

Entry at 11+ means moving school at the natural end of primary education, into Year 7. For most families this means one of two things: a state grammar school, selected by an 11+ test (the full landscape is here), or an independent senior school with a Year 7 intake, selected by its own entrance exams. Preparation typically runs through Years 4–6, with tests in the autumn of Year 6 and offers by the spring.

Entry at 13+ means moving into Year 9, the traditional entry point of the classic independent senior schools, especially boarding schools. The child spends Years 7 and 8 at a prep school (or, less commonly, a state secondary), and selection usually happens early — the ISEB Common Pre-Test or a school's own assessment in Year 6 or 7 — with Common Entrance or the school's final exams in Year 8 confirming a conditional offer. The whole 13+ system is explained here.

One structural fact should be on the table before anything else, because it collapses a common misconception: choosing 13+ usually does not spare a ten-year-old from assessment. Most 13+ selection happens at pre-test age — Year 6 or 7, the same window as the 11+. What 13+ genuinely changes is when the child moves school and how long the confirmation tail runs, not whether there is an exam at eleven-ish. If your reason for preferring 13+ is "she'll be older when it counts", check that against how your actual target schools select — for some it is true, for many it is only half true.

The factors that genuinely decide it

1. What your target schools actually offer

This is the factor that trumps the others, and the one to establish first. Schools set their entry points; families choose among them.

  • Grammar schools admit at 11. If a state grammar is the goal, the 11+ is the route, full stop.
  • Traditional boarding schools mostly take their main intake at 13+, and Year 9 is where the whole cohort arrives together.
  • Many independent day schools, especially in London, now centre on 11+ entry — and a number of senior schools have expanded 11+ intakes in recent years. A school your own school-days memory files under "13+" may now fill most of its places at 11.
  • Some schools admit at both points — but rarely in equal numbers, and the balance shifts. The only reliable source is each school's current admissions page or a phone call to its registrar.

Draw up your realistic list of schools first, then read off which entry points they actually offer, at what scale. Families who choose the entry point first and the schools second sometimes discover they have prepared for a door that is barely open.

2. Your child, now and projected

The child in front of you is the second-biggest factor, and the honest questions are these:

  • How are they developing academically? The 11+ rewards children who are fluent and exam-steady at ten. A child who is clearly able but maturing more slowly — socially, organisationally, or simply in exam craft — may show far better at a 13+ pre-test a year later, and better still by Year 9. Two more years is a long time at that age, and later developers are the classic case for 13+.
  • How do they handle pressure now? An 11+ campaign concentrates pressure into Year 5–6. The 13+ road spreads a lighter load over more years — which suits some children and wears others down (the Year 7 dip is real). Neither profile is better; they are different shapes of the same weight.
  • Are they ready to move at 11 — or better served by being senior? Some children are straining at the edges of primary school by Year 5 and need the bigger pond now. Others benefit enormously from Years 7–8 at the top of a prep school — captaining teams, leading, growing — before joining a senior school. Both are real advantages; only one fits your child.
  • What do they want? By Year 5 or 6 a child's own reaction to schools visited is evidence worth weighing. Not decisive — but a route the child has some ownership of survives the hard patches better than one imposed.

3. Where you live and what is free

Geography and money are unglamorous and decisive.

If you live in an area with strong grammar schools, the 11+ offers something no independent route can: a selective education at no fee. Over seven years the difference runs to six figures, and it is not a detail — for many families it settles the question honourably on its own. (How realistic the grammar option is depends on the school: super-selectives and catchment grammars are different propositions.)

The 13+ road, by contrast, usually means prep-school fees through Years 7–8 before senior school fees begin — the most expensive version of the choice. The exception is the family routing to 13+ from a state primary or secondary, which is less common but entirely possible; that road has its own guide.

And if boarding at 13 is the destination under consideration, weigh it as a life decision, not just an academic one — we've written honestly about what boarding at 13 asks and offers.

4. The current school's runway

A child at a prep school that runs to 13 has a natural 13+ road; leaving at 11 is possible but cuts across the school's design, and the top years the child would miss are often where prep schools deliver most. A child at a primary school that ends at 11 has a natural 11+ moment; engineering a 13+ route from there requires an intermediate step and some planning. Neither is a wall — both are gradients, and it is worth being honest with yourself about how much of your preference is really the path of least resistance. Sometimes the path of least resistance is also simply right.

Can you keep both doors open?

Partially, and at a cost. The timelines overlap awkwardly: grammar registration closes in the summer before Year 6, 11+ tests fall in early Year 6, and many 13+ pre-tests are sat in the same year or the one after. A family genuinely undecided must therefore explore both in Years 4–5 — visiting both kinds of school, checking both sets of dates (11+ calendar here, 13+ calendar here) — and accept that hedging fully can mean a child sitting two campaigns of exams. Preparation overlaps substantially (the core is English and maths done well, and less tutoring than you fear), but pressure accumulates, and a ten-year-old's experience of the year should count in the ledger.

The kindest version of hedging is usually sequential, not parallel: pick the primary route deliberately, prepare for that one well, and know in advance what the fallback looks like — including the fact that some 13+ doors remain open to a child who misses at 11, and some 11+ grammar doors permit later in-year or 12+/13+ applications in certain areas. Check the specifics before relying on either.

A short, honest summary

Choose 11+ with confidence when the target schools take their main intake at 11 (all grammars, many day schools), when the child is exam-ready and socially ready to move at the end of Year 6, and when a free grammar place is realistically in reach.

Choose 13+ with confidence when the target schools centre on Year 9 entry (most traditional boarding schools), when the child is a later developer who will be better served by two more years of growing before the move, and when the current school's road naturally runs to 13.

And when the factors split — schools pointing one way, the child another — weight the child. Schools are compared on websites; the child is the one who has to live the road. A slightly less prestigious door entered by a ready, willing child beats the reverse in almost every case that matters.

FAQ

Is 11+ or 13+ entry better?

Neither, in general. 11+ suits children ready to move at the natural end of primary school and families whose target schools — grammar or independent — take their main intake at 11. 13+ suits children at prep schools running to 13, later developers, and families targeting the traditional boarding schools whose main entry is Year 9. The right answer is set by the child and by what your actual target schools offer, not by a general rule.

Can we try the 11+ and keep 13+ as a fallback?

Sometimes, but check the specific schools before assuming it. Some senior schools admit at both points; others fill at 11+ and offer few Year 9 places, or the reverse. Also weigh the child's experience: two full campaigns of exams means two rounds of preparation and pressure. A deliberate single route is often kinder than two hedged ones.

Does choosing 13+ mean my child avoids exams at 11?

Often not. Most senior schools selecting at 13+ use the ISEB Common Pre-Test or their own assessment sat in Year 6 or Year 7 — around the same age as the 11+. What 13+ delays is the school move and the final confirmation exams, not necessarily the first assessment. This surprises many families and belongs at the centre of the decision.

What if grammar schools and independent 13+ schools are both realistic options for us?

Then the timeline forces an early look at both: grammar registration closes in the summer before Year 6, and 13+ registrations and pre-tests often fall in the same window. Visit both kinds of school in Year 4 or 5, be honest about cost — a grammar place is free, and the difference over seven years is substantial — and let the child's reaction to the actual schools carry real weight.

Duke Harewood runs aitutors.me and has a daughter in Year 8. Updated 1 September 2026.