Sure, here's an expanded version of your school day description in English for a 4th-grade level:
My school day starts at 9 o'clock in the morning. I almost always have five lessons each day. For example, tomorrow we will read stories in our literature class. Then, we will take a math test, which is very important. After that, we have physical education, where we will run and play games. In art class, we will paint a picture, and I am really excited because I love to draw. Finally, we will write an essay in Ukrainian class.
After the third lesson, we have a lunch break. I usually eat lunch with my friends in the school cafeteria. I like this time because I can relax and talk with my classmates.
My lessons end at 1 o'clock in the afternoon. After school, I go home. Sometimes I have homework to do, but I also have time to play and rest. I enjoy my school days because I learn new things and have fun with my friends.