Welcome! This tutor lets you practice one chapter at a time. Pick a chapter below and answer 20 multiple-choice questions. The questions start easy and get harder each time you answer correctly; if you miss one, the next question stays at the same level so you can master it before moving on. Many questions include a diagram to reason from. Every question is freshly generated — the numbers, names, goods, and brands change on each run — so no two attempts, and no two students, see quite the same quiz. There is no login and nothing is saved, so practice as often as you like.
A dress rehearsal for the real thing: questions from every chapter, interleaved, with no feedback until the end and a countdown clock. When time runs out the exam submits itself. No hints, no story mode.