The discussion centers on the need for textbooks in math, biology, physics, and chemistry for high school students (grades 9-12) in the USA. The user, currently in Vietnam and preparing to study Biomedical Engineering at the University of North Texas, seeks guidance on affordable resources for these subjects. They express a lack of familiarity with US educational materials, noting that there is no standard textbook used across the country. The user also highlights their limited experience in science and laboratory work, emphasizing the urgency of finding suitable textbooks to aid their studies.