BT Exam Practice helps people prepare for the Registered Behavior Technician (RBT) exam. Start with a free 20-question check scored by domain, then take short quizzes for each domain, drills on concepts people often mix up, and a timed 85-question mock exam. Each question explains why the wrong answers are wrong, and the free practice needs no signup. An optional $49 plan adds more drills, more mock exams and a study schedule.