1. The books upgraded from junior college can be purchased at Xinhua Bookstore, Joyo Amazon and the book purchasing center of the local education bureau.
2. Self-taught college entrance examination, related books can be purchased in large bookstores such as Xinhua Bookstore. If it is the college entrance examination, you can buy related books in Joyo Amazon and other online stores.
3. You can borrow it from seniors who have passed the college entrance examination and consult relevant information.
4. The books upgraded from junior college have certain reference value, but they can't be used to guide review. Returning to the textbook, the knowledge points in the textbook are the most basic, and some knowledge points are just changed and extended.