If you want to get good grades in the chemistry competition in senior high school, do you have to finish all the knowledge in senior high school? What else needs to be done? Please take part in the chemistry competition. ... See what level your competitors are.

If it's at the provincial level, as you said, if you want to finish the knowledge of basic high school, you generally don't have the ability to enter the first year of high school.

If it is a municipal level, just look at the topics in recent years, carefully understand each topic, and add some extensions (such as problem-solving methods), winning the prize is not a problem.