The school year is divided into two semesters: A and B. There are A and B Textbooks, Workbooks, Teacher’s Guides, and Tests for each grade. Textbooks, Workbooks, and Teacher’s Guides are necessary to successfully use this program. Tests are optional. Home Instructor’s Guides are forthcoming (Grades 1A and 1B will be released summer 2021). There’s also a Dimensions Math video subscription. Free Dimensions Math resources, such as Blackline Masters, can be found here.