Mathematics and physics: excellent. com。 An excellent website for learning mathematics, physics and chemistry. Basically, the basic topics that primary and secondary school students usually encounter are all involved. As long as they can't type in the search bar, they can be searched out, and they can also search and download test papers, which is very convenient. Every problem has a detailed analysis, and all kinds of problems are classified. According to this classification, websites can provide topic training for such problems. There are more than 10 thousand math papers to choose from, which is very convenient, but some of them are charged.
Chinese: 51-Worry-Free Middle School Chinese website, which is full of information-omnipresent and targeted.
I wish you progress in your study!