The test center of high school supplementary books, commonly known as black bear, is recommended to students with a certain foundation or high pursuit. The topic inside is still very difficult, but for those who want to get full marks in the college entrance examination, the topic inside must be understood. If you are weak at this stage, you can choose White Bear, because the content inside is basic, so it is better for students who want to get high marks.

Wang Houxiong cooperated with Little Bear Book (Wuhan Relay Book Publishing Co., Ltd.) to produce a series of recognized supplementary books, commonly known as Black Bear and White Bear.