It is ok to link the whole process of the Olympic Games in the college entrance examination with the preliminary contest, but you should know that there are other contents besides textbooks. The preliminary contest is similar to the college entrance examination. I suggest buying Li (captain of the national team) for math and Shu Yousheng for physics.

Math: You must make up your mind to compete.

A set of lectures on more than 20 high school mathematics competitions. Not all bookstores in Hefei are complete. ?

In addition, advanced mathematics or mathematical analysis textbooks of Peking University.

Just join the league: then find a math contest course at random.

Sprint for Gold Medal: A Course of Mathematical Olympiad in Senior High School?

Volumetric segmented

All kinds of websites are sold, and some can't be ordered by phone from the largest bookstore in Hefei.

Physics: high school physics competition training textbook (high 1 volume)?

This is good, but I haven't found all of them yet.

also

It is also divided into several volumes. It was written by Shu Yousheng.

If the difficulty is low,

Textbooks of physics department. Other electromagnetic and optical textbooks and so on.