Cerego can be used as a textbook replacement, or supplement. It uses two science based principles - retrieval practice or “testing effect” and distributed learning or “spaced repetition” - to help turn study into actionable knowledge.Cerego Courseware is available for the following subjects: Biology (Majors/Non Majors), Anatomy and Physiology, Macro/Micro Economics, US History (Pre-colonial to Civil War, Reconstruction to Present), Introduction to Sociology and Statistics.