20 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
Always identify which curve shifts first. A scenario about consumer confidence shifts AD; a scenario about input costs shifts SRAS; a scenario about resources/technology shifts LRAS.
Don't mix up the spending and tax multipliers. Spending multiplier = 1 ÷ MPS. Tax multiplier = −MPC ÷ MPS (smaller in magnitude, opposite sign).
A recessionary or inflationary gap is about the relationship between equilibrium GDP and potential GDP — always compare the two before answering.
Read the explanations even when you got it right. Each one teaches a small fact that often returns in a different form on the exam.