The Secret Book of Learning and Thinking-Training Course of Mathematical Thinking in Primary Schools, with the aim of improving students' intelligence, was carefully compiled by front-line teachers in excellent domestic schools. This book re-integrates the fragmented primary school mathematical olympiad curriculum into the twelve-level system of Xuesi Primary School, so that outstanding primary school students can enjoy professional primary school mathematics education. The primary school Olympic Mathematics 12 level system divides the content that the whole primary school needs to master into eight major questions: calculation questions, integer questions, graphics questions, application questions, travel questions, combination questions, counting questions and comprehensive questions.