As a teacher, I have had so many teacher´s book, student´s book, workbook and from different grade, levels and so on.
I saw how the children threw them away at the end of the school year. I used to give them away for paper recycling but those places are not around anymore.
Old textbooks are not good for donations, since the Publishing Companies come out with different series every year.
See more at:
https://eflelementaryresources.blogspot.com/2018/08/recycle-old-esl-elementary-textbooks.html?fbclid=IwAR28uC3F1hhDWivuX6DLAtcPReiEbynQDxW0sJqj9LNDXVpnrWVnHLctPOA