This book provides a lot of the SAT and PSAT math questions that include abundant the SAT and PSAT math types. During the real test period, if the types of the most test questions examinee has met and practiced before, then the test result goes without saying. The question explorations of this book primarily use the logical steps to let users easily memorize the methods of solving questions. The essence of mathematics is logic. Human thinking naturally accepts the formula of "because" and "therefore". Hence, using mathematically logical steps to solve questions directly is in harmony with the natural function of human brain. Furthermore, it is helpful for memorizing because what you need to remember are the mathematically logical steps, which is refined and easily to be memorized, instead of the mixed explanations of English and math that are difficult to memorize.