This practice set contains 20 multiple-choice questions selected for the concepts and calculation types that Korean AP Calculus AB students most frequently miss: sign errors in implicit differentiation, forgetting endpoint checks, mixing up and conditions, dropped chain-rule factors, and bound-changing errors in substitution.

• Work each problem before looking at the choices. Select an answer to lock it in and see the explanation immediately.
• Questions marked calculator permitted may use the built-in Desmos graphing calculator (top-right).
• Use the flag button to mark a question for later review.
• Use Print for a two-column, ink-efficient paper copy with a full answer key and explanations on the final page.