2. "Huabei" real problem is the best exercise library to improve the ability of solving Olympic math problems. The "China Cup" has been developed for more than 20 years since it was first held. The development of "China Cup" represents the development of China Olympic Mathematics. The "China Cup" is an excellent learning plan for Olympic Mathematics, which guides the direction of Olympic Mathematics learning. 50% of the topics in the thinking guidance textbook of Beijing Renhua School come from the real questions and training questions of the "China Cup" over the years.
3. The real question of "Huabei" is an important test source for junior high school entrance examination and key middle school placement examination. Children in the sixth grade of primary school are about to face a large number of junior high school entrance exams and placement exams. According to the long-term research on the junior high school entrance examination of the experimental classes in the middle school attached to the National People's Congress, experimental middle school, 10 1 middle school and other key schools, the teaching and research group of Xueersi specialty found that most of the latest examinations in these schools were adapted from various cups in recent years, among which the true questions of "China Cup" appeared the most frequently. Most North China test questions are typical, with flexible skills and methods, which will be favored by teachers in key middle schools. The training and induction of real questions can accumulate rich practical experience for children in the senior high school entrance examination, reserve the necessary number of questions in the senior high school entrance examination, and provide the most referential guidance for the senior high school entrance examination.