You can search and buy on Taobao, JD.COM, Dangdang and other online shopping platforms. You can directly find the official flagship store of the publishing house or ask the specific customer service, or you can consult the clerk of the offline bookstore before making a purchase. Under normal circumstances, there will be no major changes in textbooks, so last year's textbooks can also be used. If the versions are the same, they can be used in any session.