25 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
For motion, take derivatives: velocity is s′(t), acceleration is s″(t); speeding up needs matching signs.
For related rates, differentiate w.r.t. t before substituting numbers.
For L’Hospital, confirm 0/0 or ∞/∞ first, then differentiate top and bottom separately.
Read the explanations even when you got it right, and always state units in context.