1–8 Overlap: Number Sense · Ratio & Proportion · Algebra & Equations · Sequences & Graphs · Angles & Shapes · Pythagoras & Trigonometry · Statistics · Probability
9 GCSE-only: Advanced Algebra & Functions (surds, quadratics, function notation, bounds, iteration)
10 MYP-only: Real-World Math Investigations (scale & similarity, compound growth, statistical sampling, Venn reasoning)
Each unit begins easy and climbs to word-problem difficulty. All 10 units are shuffled together and get harder as the whole book unfolds.