1. You mentioned you have an IGCSE Grade 9 exam in 3 days covering many topics including numbers, algebra, geometry, statistics, and more. 2. The best approach now is to focus on key concepts and practice problems rather than trying to learn everything from scratch. 3. Start with understanding the types of numbers: natural numbers, integers, prime numbers, square and cube numbers, rational and irrational numbers. 4. Review powers and roots: squares, square roots, cubes, cube roots, and other powers. For example, $\sqrt{169} = 13$ and $5^2 \times \sqrt[3]{8} = 25 \times 2 = 50$. 5. Practice fractions, decimals, and percentages: convert between forms, simplify fractions, calculate percentages of quantities, and percentage increase/decrease. 6. Understand algebra basics: substituting values, simplifying expressions, expanding brackets, and factorising. 7. Learn about sequences and their nth terms, and practice ordering numbers using symbols like $>$, $<$, $=$. 8. Review graphs of functions: linear ($f(x) = ax + b$), quadratic ($f(x) = ax^2 + bx + c$), cubic, reciprocal, exponential, and trigonometric. 9. For geometry, know terms related to polygons, solids, and circles, and practice measuring angles and bearings. 10. For statistics, understand how to read and interpret data from tables, charts, and cumulative frequency diagrams. 11. Use a calculator efficiently: enter values correctly, avoid rounding intermediate steps, and only round the final answer. 12. Manage your time: allocate study sessions to each topic, focus on understanding concepts, and solve past exam questions. 13. Stay calm and confident. Break your study into manageable parts and take short breaks to maintain focus. Good luck on your exam!