It's not the real problem. Lao Lu's motif 800 exercise is a set of guidance materials for preparing for the college entrance examination, including 800 math problems and detailed ideas and methods for solving them. This set of materials is not a real college entrance examination math test, but a set of exercises based on the characteristics and difficulty of college entrance examination math test questions over the years. Lao Lu's motif 800 exercises cover all the knowledge points and difficulty levels of high school mathematics, aiming at helping students master mathematics knowledge and problem-solving skills in an all-round way and improving their ability to take exams in mathematics.