Dear Anne,
I am happy to hear from you. There is a "double reduction" policy in our country. So there are many changes in our school life. I'd like to tell you something about my new school life.
What is your school life like? Hope to hear from you soon.
Yours,
Li Hua

One possible version: Dear Anne, I am happy to hear from you. There is a "double reduction" policy in our country. So there are many changes in our school life. I'd like to tell you something about my new school life. Our school starts at 8:00 a. m. and finishes at 4:30 p. m. We have Chinese, Maths, English, Geography, Biology and so on. My favourite subject is Geography because I can learn about the world. After-school activities are great fun too. There are different kinds of clubs and after-school activities in our school. We can play badminton, basketball or volleyball with our classmates in our free time. We can have a field trip as well each term. We go to the farm to help farmers to pick apples and plant trees. I think my school life is interesting and meaningful. What is your school life like? Hope to hear from you soon. Yours, Li Hua