If you want to train excellent students in the classroom, I recommend doing top students' mathematics or Olympic Mathematics published by East China Normal University Press, or Huang Dongpo's new thinking. If you want to go back to the past by going up a flight of stairs, you can take an Olympiad course to cultivate new methods for outstanding students and the great vision of academic elites. If you want to participate in the Olympic Games, I strongly recommend the Olympic Mathematical Series.