Don't buy goods from China. I won't think about it if I buy it.

Buy yourself a grammar book. I think the grammar books of Thin Ice series are relatively simple and practical.

History, geography and politics, I haven't had time to read it.

Physics can be considered, but the school will issue exercises. If you have any questions, you'd better ask the teacher directly.

You can buy chemistry. If you have a poor foundation, you can buy exercise books directly if you have a good foundation.

Biology really doesn't need to read more books. All the knowledge of biology comes from books.

Reference books, don't take them too seriously. Many subjects are bought and finished, and they have not been turned over.

Let's focus on the class!