You can go to the free Postgraduate Entrance Examination Network or Postgraduate Entrance Examination Forum, but the materials that can be downloaded directly from the Internet are not very valuable. I suggest you find some professional organizations to buy valuable materials. After all, one's postgraduate entrance examination is one's own major event, and it is worthwhile to spend some money. I bought information on the cross-examination before, and I feel that the value is not bad. It's all internal information of various schools, and the price is acceptable. You can ask if you are interested. I hope you succeed in the postgraduate entrance examination!