High school students with weak foundation. The compulsory examination questions in the butterfly change are the mathematical materials reviewed by senior one. The question type is close to the entrance examination, and the content is detailed. Butterfly college entrance examination must brush questions for high school students with weak foundation, because the butterfly college entrance examination must brush simple questions, which are suitable for students with weak foundation to practice and help them consolidate their basic knowledge and improve their problem-solving ability. At the same time, the title of this book is very comprehensive, covering the knowledge points of all subjects in the college entrance examination, which helps students to fully understand the examination contents and requirements of the college entrance examination.