Grade two in primary school, grade three in summer vacation and autumn, and grade four in winter vacation and spring.

Under the guidance of Professor Tao, a well-known mathematics educator and outstanding practitioner of extraordinary education in China, and with the attention of examiners of many national key events such as China Cup, a group of core teaching and research teams from key universities such as Tsinghua Peking University, with brilliant competition and training records, finally launched this set of "Extraordinary Children Training System" and "Excellent Children Intelligent Development System" after a long period of full brewing and repeated research.

The 12 level system has incomparable advantages over other versions of Olympic Mathematics textbooks: teaching students in accordance with their aptitude, making them easy to understand, being systematic and scientific, practicing thinking and skills together, and giving consideration to examination and interest.