22 College Board–style multiple-choice questions on Imperfect Competition, each with a full explanation of why the right answer is right and the others aren't.
Memorize the MR = MC rule cold. It's the answer key to almost every profit-maximization question in this unit and the next two.
Know your shutdown and break-even reference prices. P vs. min AVC determines shutdown; P vs. min ATC determines profit, loss, or break-even.
Watch for "accounting" vs. "economic" profit language carefully. The exam often tests whether you remember that economic profit subtracts implicit costs too.
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.