The olympiad, in popular terms, is a difficult math problem. In fact, every problem is the integration and expansion of some basic knowledge. Many people think the problem is difficult because the basic knowledge is not solid and the principle is not understood.
My suggestion is that the foundation must be solid, every mathematical principle must be clear, and the formulas to be mastered must be skilled. In addition, do more questions to consolidate the foundation. Then do some technical problems properly, because there is really only one solution to many problems, so you should be well informed and sum up the ideas and skills of solving each problem.
One of the great benefits of learning Olympic Mathematics is to use children's curiosity to improve their interest in mathematics. But there are many ways to increase interest, not just this one. Sometimes we adults force our children to do 100 things, and it is better for children to understand a truth through reading.
Just like my children, they used to be very careless about their studies, but suddenly they have changed: they know to study actively, review, preview and make a study plan. Whether you want to learn Olympic Mathematics depends on your child's specific situation: if possible, it is best to try while learning, which can broaden your mind; There is no need to pursue achievements.