Of course. There is little change in the outline of postgraduate entrance examination every year, and there is almost no change. You can use old materials, but different students have different ways to use them. If it is the first postgraduate entrance examination in 2023, those who are used to marking their own key points and like to take notes are advised to buy new materials from professional books. If there is little change in English mathematics in public courses, you can use old materials, such as word books. If you don't like taking notes and are willing to read other people's notes, it is very appropriate to use second-hand materials.