IGCSE Maths is broad. Add Maths is more compressed.
IGCSE Maths, especially Cambridge 0580, asks students to handle a wide range of topics: number, algebra, geometry, graphs, probability, statistics, and problem solving. A student can sometimes compensate for one weaker area by collecting marks elsewhere. Add Maths, especially Cambridge Additional Mathematics 0606, is less forgiving because many chapters rely on algebraic control and symbolic reasoning.
If algebra is slow, Add Maths feels heavy very quickly. If a student only copies example patterns, Add Maths exposes that habit because the question may change the form, combine ideas, or require a rearrangement before the familiar method even appears.

