Complete Mathematics is a full revision guide for Cambridge IGCSE Mathematics (0580) and Cambridge O Level Mathematics, written for the 2025–2027 syllabus. It was built for one purpose: to take students from confusion to confidence. Whether you are meeting a topic for the first time or pushing for the highest grades, every concept is explained step by step, not just how, but why. All nine units of the Extended course are covered in full, from Number through to Statistics, with clear notes, fully worked examples, proper mathematical notation, and hundreds of original exam-standard questions. Every calculation has been checked and every answer worked through. Inside this book: • Complete coverage of the Cambridge IGCSE and O Level Extended syllabus • Step-by-step notes with fully worked examples and proper exam layouts • Key Terms, Exam Tips, and Watch Out boxes in every section • Test Yourself questions throughout, with full answers • Exam-Style Questions per unit: Section A (non-calculator) and Section B (calculator) • Complete answers with mark-scheme guidance • List of formulas given in the exam, plus the formulas you must memorise • Command words glossary and notation reference Written by a teacher who has spent years in front of Cambridge mathematics students and knows exactly where marks are won and lost.