5 STEPS TO A 5

MP3 files recorded on disk, [ CD-Roms, ] downloadable e-books, [ and computer software ] containing educational materials in the fields of biology, calculus, chemistry, foreign languages, English, environmental science, economics, microeconomics, macroeconomics, geography, history, math, politics, physics, psychology, science, and statistics

Series of textbooks in the areas of science, biology, English, psychology, and history; Series of textbooks in the areas of math, calculus, environmental science, geography, economics, microeconomics, macroeconomics, physics, statistics, and politics