The most authoritative information of Si Pei is the real question published by Si Pei. There are 5 sets, each with 2 questions, so there are 10 sets of questions. There are also several sets of free questions. Spike Zhenti official has also published some other books, with analysis on how to use them. There is also the official information guide of Sipei, as well as the preparation strategy of the first Sipei education in Canada and the full series of Sipei books. This is the most commonly used review material for candidates from China and Canada, as well as South Africa, Hongkong and Taiwan Province provinces.