I recommend you to buy a copy of New Thinking edited by Mr. Huang Dongpo. Rich in content, covering all types of math problems in junior high school. It is a typical topic in senior high school entrance examinations and competitions around the country. I'm doing it. It's very useful.

Ask if you have any questions.

I am Warcraft 147 1770038 that never gives up.

Please step on the gas! ! ! ! ! ! ! ! !