Does Gender Matter in Year 6 Outcomes?

There is a widespread perception among parents that girls tend to do better in primary school assessments while boys "catch up later". Like most generalisations about education, it contains a kernel of truth wrapped in a great deal of nuance, and the picture specifically at the 11+ is more complicated than either the cliche or its dismissal suggests.

At the national KS2 level, the data is fairly consistent: girls outperform boys in Reading and Writing assessments by a meaningful margin. In Maths the gap is narrower and varies more from year to year, with some years showing near parity. These are national averages published by the DfE and they are real. But national averages in state assessments and 11+ outcomes are not the same thing, and the relationship between them is less direct than it might appear.

Grammar school intake data tells a more varied story. Many grammar schools are single-sex, which removes the gender comparison entirely from their intake figures. In mixed-intake grammars, the gender split among successful candidates varies considerably by school, by region, and by year, and there is no consistent national pattern that shows girls or boys systematically outperforming the other. What the data shows is substantial school-to-school variation, which is driven by geography, local catchment, the specific exam used, and the pool of children sitting in a given year, more than by gender as a standalone variable.

The relative age effect is worth understanding. Children born in September are almost a full year older than children born the following August when they sit the 11+, and there is solid evidence that this age gap affects outcomes, particularly at younger ages. Some research suggests boys may be marginally more affected by relative age than girls, though the finding is not universal. GL Assessment uses age-standardised scoring, which is intended to partially correct for this: a child's raw score is adjusted relative to children of the same age in months, not just the same year group. This mitigates but does not eliminate the effect entirely.

Looking at individual subjects, there are some patterns in the population-level data. In verbal reasoning, girls tend to score slightly higher on average, consistent with the broader reading and vocabulary advantage seen in KS2. In non-verbal reasoning, findings are more mixed, with some studies showing a slight male advantage in spatial tasks and others finding no meaningful difference. In maths, the scores are broadly comparable at this age, with individual variation far outweighing any gender pattern. None of these are large effects. All of them are dwarfed by the variation within each gender group.

That last point is the most important one. Population-level averages describe groups, not individuals. A well-prepared child, of any gender and any birth month, has a strong chance. The data simply does not support the conclusion that one gender is at a systematic disadvantage in the 11+. What it does suggest is that for some boys, particularly those who are summer-born or who have struggled to build strong reading habits, beginning preparation slightly earlier and making deliberate efforts around vocabulary and reading engagement can make a real difference.

If you have a son preparing for the 11+, the practical implications are modest. Building a reading habit early, genuine enjoyment of books rather than a chore, matters more than any specific revision technique. Structured practice with clear, visible short-term goals tends to work well for children who are kinaesthetic and goal-oriented. Gamified progress systems, such as streaks, XP, and personal bests, can provide the motivation structure that makes daily practice sustainable. But none of that is about gender as an innate trait. It is about understanding your individual child and designing a preparation approach that works for them.