You need one set of 2 Binders for each high school year (100 - 500). Whether you get a complete upper-level program or mix-and-match your History/Bible and Literature/Language Arts, you will need one binder for you and one for your student. Use these two large 3" spine binders with plenty of room for your level 100 - 5 Sonlight resource: https://www.sonlight.com/products/required-resources-high-school-packages