This parent, studying and thinking about the Olympics, explained in detail. And generally, children with basic skills are interested in learning. However, junior high school students don't have to focus too much on the Olympics. Just do the test questions for junior high school students. The test questions in junior high school are also difficult to drop. I suggest you buy a copy of "typical questions for entering a higher school after primary school graduation", which has three subjects: Chinese, mathematics and English. The questions above are also good.

However, if you know olympiad, you'd better tutor your children yourself! You can buy a new method of creating excellence in mathematics contest, which is very cheap on Taobao.