THE BRIDGE YEARS
What is Key Stage 3?
In England, school is organised into blocks called key stages. Key Stage 3 — KS3 — covers Years 7, 8 and 9: ages 11 to 14, the first three years of secondary school.
THE ENGLISH SCHOOL JOURNEY · AGES 4–18
Key Stage 3 · Years 7–9 · ages 11–14
The first three years of secondary school. No national exam — and the years where the foundations of every GCSE are laid.
THE ENGLISH SCHOOL JOURNEY · AGES 4–18
- Receptionage 4–5
- KS1Years 1–2 · ages 5–7
- KS2Years 3–6 · ages 7–11 · ends with SATs
- KS3 — your child is hereYears 7–9 · ages 11–14The first three years of secondary school. No national exam — and the years where the foundations of every GCSE are laid.See the full map ↓
- KS4Years 10–11 · ages 14–16 · GCSEs
- Sixth formYears 12–13 · ages 16–18 · A-levels
The years nobody measures
Primary school ends with SATs. GCSEs begin in Year 10. Between them sit three years with no national exam — which is why KS3 is sometimes called the forgotten years. Nothing is formally tested; almost everything that matters is quietly decided. The ideas a child secures in Years 7–9 set the ceiling on their GCSE options and grades.
If you didn’t go to school in the UK
None of this is obvious — and it isn’t meant to be guessed. The timeline above is the whole journey, ages four to eighteen. Your child is in the double-ruled block.
Arrival & foundations
New school, seven subjects taught by specialists for the first time. The year for securing the ground everything else stands on.
The deepening year
Ideas start depending on each other in earnest — algebra leans on number, chemistry leans on the particle model. The classic dip year; momentum matters.
The launchpad
The bridge into GCSE: options are chosen, early GCSE ideas appear on the horizon, and secure foundations quietly become grades.
Why a map
Three years. Seven subjects. Hundreds of small ideas that depend on each other in a definite order — you can’t collect like terms until 3x means three lots of x. The map shows every one of them, and what must come before what.
EVERY LINK SAYS WHY
Why order matters
“You can’t weigh chances you can’t write down.”
“Concentration is a ratio: how much stuff in how much water.”
“F = ma is a two-step equation wearing a lab coat.”
Your child, on this map
Their tutors teach to this exact landscape — and quietly record which ground is secure, what’s being built this term ▲, and what waits at the horizon. The map you’ve just explored is the same one their tutors keep for them.
Or start with their Learning Genius quiz — free.
FOR PARENTS
KS3 questions, answered
What is Key Stage 3?
Key Stage 3 (KS3) is the first stage of secondary school in England — Years 7, 8 and 9, ages 11 to 14. It sits between primary school (which ends with SATs in Year 6) and the GCSE years (Years 10–11).
What ages and years does KS3 cover?
Years 7, 8 and 9 — normally ages 11 to 14. Your child starts KS3 the September after finishing primary school.
Is there an exam at the end of KS3?
No. KS3 has no national exam — schools assess internally, in different ways. That absence is exactly why these years are sometimes called the forgotten years: nothing is formally measured, yet the foundations of every GCSE are laid here.
Why does KS3 matter for GCSEs?
GCSE courses assume the KS3 ground is secure — algebra assumes number, chemical equations assume the particle model. Gaps left in Years 7–9 don't disappear; they surface in Year 10 with less time to fix them. The ideas a child secures in KS3 set the ceiling on their GCSE options and grades.
What subjects does my child study in KS3?
The national curriculum sets a broad core — English, maths, science (biology, chemistry, physics), history, geography, languages, and more. The KS3 Map covers the seven subjects our tutors teach: Maths, English, Biology, Chemistry, Physics, History and Geography.
How is KS3 different from primary school?
Subjects are taught by specialists rather than one class teacher, ideas start depending on each other across subjects, and the pace of new concepts roughly doubles. The map exists to make that invisible structure visible.
Every topic on the map
The full list behind the constellation — each topic with what it builds on, and why that order matters.
Maths 23 topics
Year 7
Place value & ordering
Read, write and order integers and decimals of any size.
Negative numbers
Order, add and subtract with numbers below zero.
Order of operations
Apply the agreed order: brackets, indices, × ÷, + −.
Builds on: Negative numbers
Fractions of amounts
Find fractions of quantities and simplify fractions.
Reading algebraic notation
Read 3x as “three lots of x” — letters standing for numbers.
Simplifying expressions
Tidy an expression so its structure shows.
Builds on: Reading algebraic notation — “Simplifying starts from reading the notation correctly.”
Inverse operations
Every operation has an undo — subtraction undoes addition.
Builds on: Order of operations — “To undo operations in reverse order, you must know the order they happen in.”
Ratio notation
Write and simplify ratios; share in a given ratio.
Perimeter & area
Perimeter and area of rectangles, triangles, compound shapes.
Averages & range
Mean, median, mode and range from raw data.
Year 8
Collecting like terms
Gather matching terms so long expressions shrink.
Builds on: Simplifying expressions — “Collecting terms is simplifying, made a habit.”
Fractions ↔ decimals ↔ %
Move fluently between the three notations.
Builds on: Fractions of amounts — “Converting starts from knowing what a fraction is.”
One-step equations
Solve x + 4 = 11 or 3x = 12 by undoing one operation.
Builds on: Inverse operations — “Solving is undoing — inverse operations are the tool.” · Reading algebraic notation — “You can’t solve a sentence you can’t read.”
Solving two-step linear equations
Undo operations in reverse order to find the unknown in 3x + 4 = 19.
Builds on: One-step equations — “Two steps are one step done twice — make one step automatic first.” · Collecting like terms
Ratio & proportion problems
Solve sharing and scaling problems — recipes, maps, best buys.
Builds on: Ratio notation — “Proportion problems need the notation first.” · Fractions of amounts
Angles in polygons
Interior and exterior angles; angle sums.
Builds on: Perimeter & area
Probability of single events
Express chance as a fraction on the 0–1 scale.
Builds on: Fractions of amounts — “You can’t weigh chances you can’t write down.”
Year 9
Linear graphs y = mx + c
Plot lines and read gradient and intercept.
Builds on: Solving two-step linear equations — “A graph is an equation drawn — solve before you draw.”
Simultaneous equations
Two unknowns, two equations, one consistent story.
Builds on: Solving two-step linear equations — “Two-step fluency before two equations at once.” · Linear graphs y = mx + c
Scatter graphs & correlation
Plot paired data; describe correlation honestly.
Builds on: Averages & range — “Summaries first, patterns second.”
The GCSE horizon
Quadratic expressions
Expand and factorise with x² — the next algebra.
Builds on: Collecting like terms — “Like terms keep x² tidy.”
Trigonometry first steps
Sine, cosine and tangent as ratios in right-angled triangles.
Builds on: Angles in polygons — “Trig lives inside triangles’ angle facts.” · Ratio & proportion problems
Combined events
Two dice, two spinners — multiplying chances.
Builds on: Probability of single events — “Two dice are two single events, multiplied.”
Physics 10 topics
Year 7
Energy stores & transfers
Track where energy starts, moves and ends up.
Speed = distance ÷ time
Calculate speed and read distance–time graphs.
Builds on: Ratio notation (MATH)
Forces & balance
Identify forces and reason about balanced pairs.
Light & sound basics
How waves carry energy — reflection, pitch, loudness.
Year 8
Current & simple circuits
Build circuits; measure current and voltage.
Pressure & moments
Levers, turning forces and pressure in fluids.
Builds on: Forces & balance — “Moments are forces given a lever arm.”
Electromagnets
Coils, cores and fields you can switch off.
Builds on: Current & simple circuits — “No electromagnet without a working circuit.”
Year 9
Newton’s laws (qualitative)
Why things keep moving, speed up, or push back.
Builds on: Forces & balance — “The laws formalise your balanced-forces intuition.”
Rearranging F = ma
Use and rearrange F = ma to find any one of the three.
Builds on: Newton’s laws (qualitative) — “Rearranging only helps once the law itself makes sense.” · Solving two-step linear equations (MATH) — “F = ma is a two-step equation wearing a lab coat — rearranging it IS maths.”
The GCSE horizon
Work, power & efficiency
Rating energy transfers: how much, how fast, how wasteful.
Builds on: Energy stores & transfers — “You can’t rate a transfer you can’t trace.” · Rearranging F = ma
Chemistry 8 topics
Year 7
Particle model & states
Solids, liquids and gases as arrangements of particles.
Atoms, elements & compounds
The cast list of chemistry — what everything is made of.
Builds on: Particle model & states — “Atoms only make sense as the particles in the model.”
Separating mixtures
Filtering, evaporating, distilling — chosen by particle picture.
Builds on: Particle model & states — “Choosing a separation means picturing the particles.”
Year 8
The periodic table
The organising shelf for every element.
Builds on: Atoms, elements & compounds — “The table organises elements — know what one is first.”
Chemical reactions & equations
Atoms rearrange; word and symbol equations record it.
Builds on: Atoms, elements & compounds — “Reactions rearrange atoms; you need the cast list.”
Acids, alkalis & pH
The pH scale and neutralisation.
Builds on: Chemical reactions & equations
Year 9
Concentration
Compare and calculate how crowded a solution is.
Builds on: Ratio & proportion problems (MATH) — “Concentration is a ratio: how much stuff in how much water.” · Separating mixtures
The GCSE horizon
Moles — counting by weighing
Scaling from grams to numbers of atoms.
Builds on: Concentration — “Moles scale the concentration idea down to atoms.”
Biology 8 topics
Year 7
Cells & microscopy
Plant and animal cells; using a microscope well.
Tissues → organs → systems
How cells team up into working bodies.
Builds on: Cells & microscopy — “Organs are teams of cells — meet the players first.”
Year 8
Digestion & nutrition
Your first full system story, from plate to cell.
Builds on: Tissues → organs → systems — “Digestion is your first full system story.”
Respiration & breathing
Releasing energy in cells; moving gases in and out.
Builds on: Tissues → organs → systems — “Gas exchange needs the organ map.” · Chemical reactions & equations (CHEM)
Reproduction
Gametes, fertilisation and development.
Builds on: Cells & microscopy
Ecosystems & food webs
Interdependence: who eats whom, and what breaks.
Year 9
Inheritance & variation
Why offspring resemble — and differ from — parents.
Builds on: Reproduction — “Inheritance starts where reproduction ends.”
The GCSE horizon
Natural selection — the evidence
How variation plus time rewrites species.
Builds on: Inheritance & variation — “Selection acts on variation.” · Ecosystems & food webs
English 7 topics
Year 7
Retrieval & inference
Find what a text says — and what it means underneath.
Writer’s methods
Spot the choices: imagery, sentence shape, sound.
Builds on: Retrieval & inference — “You can’t analyse choices you haven’t noticed.”
Paragraphs & topic sentences
Build paragraphs that carry one idea each.
Year 8
Analytical paragraphs
Point, evidence, zoom-in — the analytical unit.
Builds on: Writer’s methods — “Analysis needs methods to point at.” · Paragraphs & topic sentences — “The paragraph is the container the argument ships in.”
Year 9
Comparing two texts
Hold two writers side by side without losing either.
Builds on: Analytical paragraphs — “Compare with paragraphs you already trust.”
Rhetoric & persuasion
Writing that moves people — ethically.
Builds on: Writer’s methods
The GCSE horizon
Unseen poetry
A portable method for a poem you’ve never met.
Builds on: Analytical paragraphs — “Unseen means your method must be portable.”
History 7 topics
Year 7
Chronology & period sense
Place events and periods in sequence with confidence.
Sources & provenance
Who made this, when, and why — before trusting it.
1066 & medieval power
Conquest, castles and the church’s long reach.
Builds on: Chronology & period sense
Year 8
Reformation & the Tudors
Faith, power and the break with Rome.
Builds on: 1066 & medieval power — “The Reformation is a reply to medieval church power.”
The Industrial Revolution
Machines, cities and lives remade.
Builds on: Chronology & period sense
Year 9
Causation essays
Arguing why — with evidence that earns its place.
Builds on: Sources & provenance — “You can’t argue why without weighing who says so.” · Reformation & the Tudors
The GCSE horizon
Interpretations in depth
Why historians disagree, and how to weigh them.
Builds on: Causation essays — “Weighing historians comes after weighing sources.”
Geography 7 topics
Year 7
OS maps & grid references
Read four- and six-figure grid references fluently.
Rivers & the water cycle
Follow water from source to sea.
Year 8
Weather vs climate
One is a mood, the other a personality.
Builds on: Rivers & the water cycle
Population & urbanisation
Why cities grow, and what that changes.
Coasts & erosion
The sea as a patient sculptor.
Builds on: Rivers & the water cycle — “Coastal processes continue the river story.”
Year 9
Fieldwork enquiry
Ask, measure, conclude — geography done outdoors.
Builds on: OS maps & grid references — “No enquiry without reading the map first.” · Averages & range (MATH)
The GCSE horizon
Climate change synthesis
Pulling weather, people and resources into one account.
Builds on: Weather vs climate — “Synthesis stands on the weather/climate distinction.” · Population & urbanisation
Drafted by AI agents against the DfE programmes of study, reviewed by humans, validated in CI. Contains public sector information licensed under the Open Government Licence v3.0. With thanks to Marble, whose open primary-years map precedes ours. Dataset version nc2013 — the national curriculum in force in England since 2014.