First, the textbooks for primary school and junior high school were given to my sister in the countryside. My primary school and junior high school are studying in our county, because the teaching resources in the county are much better than those in the countryside, and there is no shortage of books, so new books will be issued every semester. And my sister in the countryside, because of the special shortage of school funds, often let two people use a book. My uncle's sister has a unique personality and doesn't want to share a book with others, so I give him all my books every semester. At that time, our textbooks were all color pages, so it seemed that everyone wanted to learn, but many textbooks in rural areas were black and white, so there was a big difference in this point. My sister feels very happy every time she gets my book, even if there are traces of my notes on it, she won't dislike it.
Second, high school books are sold to younger brothers and sisters. My sister also went to the county seat in high school, so she didn't need my book. My high school books are all accumulated there. At that time, because my parents attached great importance to my study, they bought me many new books and exercise books every semester. When I graduated from high school, I had four sets of this book, which simulated three years of college entrance examination for five years. Each set contained all subjects, so those books accumulated higher than me. In high school, everyone liked to sell books to earn some living expenses, so they joined the ranks when they graduated from high school and sold books at the school gate for a week. In the end, these books were sold to 500 yuan.
There are many specialized courses in the university, and the books in that university contain many knowledge points I need in the workplace, so so far I haven't sold many specialized books in the university, and I still keep them at home.