To use The Story of the World in a classroom setting, you will want to choose among the following books for the appropriate Volume 1-4:
The Story of the World text, one per student.
The Story of the World Activity Book, one per teacher, paperback or PDF.
The Story of the World Student Pages, one per student, paperback or PDF. If you want to license the Student Pages, purchase the PDF and a license.
These first three are the core of the curriculum. You may also choose to purchase:
The Story of the World Audiobook, one per classroom.
The Written Comprehension Questions, if you wish to have your students write out their responses to the Review Questions in the Activity Book. One per student. If you wish to print, purchase the PDF and a license.
The Test Book, one per teacher. This book includes the answers; if you want to use the tests for students, purchase the PDF and a license.
All of these are available for purchase from The Well-Trained Mind Store.
Student materials can be purchased in paperback or PDF format, licensed so you can reproduce them for your classroom. Please read this article to understand your options: Classroom Licensing
To learn about school discounts, send email to email@example.com, and ask for that information.