Olympiad mathematics is not helpful to the improvement of mathematics, but it is biased and strange. Should mathematics be improved or its foundation be solid? I've been there before, so it's better to get rid of the garbage like Olympiad early, which has nothing to do with textbooks. Some topics of Olympiad Mathematics learned in the fourth grade of primary school are all learned in the first grade, so what's the use of learning it so early? I'm not taking the exam again.