If I’ve taught it, have they understood it, and how do I know?
It’s the question every head of English, maths and science should be able to answer for their own department, at any point in years 7, 8 or 9. However, most can’t, with any real confidence. Largely because Key stage 3 was never built to give them the evidence.
Key stage 4 has GCSEs and Key stage 2 has SATs, but Key stage 3 has neither. Across three years and three core subjects, there’s no shared national picture of who’s secure in the fundamental knowledge and who isn’t. So, schools are largely left to work that out for themselves. Some build genuinely rigorous tracking systems to do it. Others lean on end-of-topic tests that were built to check what’s been recalled rather than to catch a gap while it’s still small and easy to close. Either way, the gap tends to stay undiscovered for a long stretch, and by the time it does surface, often around year 11, fixing it means finding time the timetable doesn’t really have
Ofsted flagged this pattern in its review, “Key stage 3: the wasted years?” The government’s more recent Curriculum and Assessment Review makes much the same case. Three years meant to lay foundations often function, in practice, as a corridor between primary school and the exams that count.
Here’s what we keep hearing
If you talk to enough heads of department, you’ll see a pattern emerge across English, maths and science alike.
How many of the gaps in student understanding at GCSE and A-level have their root cause at KS3? Talk to enough departments and the number climbs higher than you’d expect
Just because a student understands the knowledge doesn’t mean they can apply it to a new situation. That distinction matters more than it sounds.
In maths, a student can recite a procedure correctly and still pick the wrong one under exam pressure. They’ve practised the method but rarely had to choose between several, so the moment a question doesn’t signal which one to use, fluency stalls.
In science, a student might explain a concept well in isolation, then stall the moment a working-scientifically question asks them to explain it rather than recall it. The knowledge is there, but the application of this knowledge isn’t.
In English, a student can write fluently and in detail about the poem studied for months, then fall silent in front of one they haven’t seen before. The skill of interpretation was never separated from the content it was practised on.
Different subjects, with the same underlying cause: knowledge that was taught but never quite secured well enough to transfer.
The scale problem for leadership
A head of department can spot this in their own classroom. A senior leader must see it across an entire cohort, in three core subjects, over three years, usually with nothing more reliable than department-level impressions to go on. That’s a much harder thing to hold in view, and an easy thing to lose track of until it shows up in a mock exam.
Often small gaps compound quietly. A student who’s slightly behind at the start of year 7 can be significantly behind by the start of year 10, not because anyone chose that outcome, but because nobody had evidence early enough to step in.
How do we ensure students have the core fundamental knowledge at KS3 to build upon, not just the exposure to it? That’s the real question for any leadership team.
What would need to change
This is a structural gap every school is managing with tools it’s had to build itself, and those tools vary hugely from one school to the next, sometimes from one department to the next in the same building.
But it’s worth asking as a leadership team: if you knew, subject by subject and student by student, exactly what had been secured by the end of year 9, how much of the year 11 scramble would simply stop happening?
That’s the question we’ve been working on. We’ll have more to say soon.