My kids don't go to school yet, but most likely I'd be keeping old textbooks just like what my mom did with our textbooks. We stored them in boxes so we could still use as reference books. Keeping old textbooks is indeed helpful. Younger siblings can also still take advantage of old books.
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My kids don't go to school yet, but I'm planning to donate the textbooks when that time comes. That's what my sisters did with my nieces and nephews' textbook.