Science Mentors are available for Biology, Chemistry, and Physics. Each volume of the interactive software presents 250 multiple-choice questions in a single discipline and are derived from prior invitational tests. The Mentor keeps up with a history of questions missed on each student's last attempt and all questions ever missed by each student so that they can hone their sessions as questions are mastered. Each installation handles up to 20 students and can be installed on multiple computers on one campus. This set of three offers one disc of each subject.