In Economics, a correct, well-labelled diagram can carry an answer. These are the ones to master cold.
Microeconomics
Demand and supply equilibrium, elasticity, returns to a factor, cost and revenue curves, and forms of market — practise drawing each quickly and labelling every axis and point.
Macroeconomics
Equilibrium of income (AD–AS / S–I), the multiplier, and government budget concepts appear repeatedly. Pair each diagram with a two-line explanation.
Presentation matters
Use a pencil and ruler, label fully, and reference the diagram in your written answer. A diagram nobody can read earns nothing.
We make these intuitive through diagram-first teaching at PAC.