What do you like doing in school?

1. I like playing baseball with my classmates on the playground after school.

2. I like studying at the library on the third floor of the school building after school.

3. I like listening to classes at my academy with my close friends.

4. I like talking with my classmates on the stand.

5. I like having a conversation with my intimate friends in the hallway at the break time. (Is it OK? What is the suitable English term for the 10 minutes' break between classes in school?)

6. I like talking the native speaker in the teachers' room at lunch time.

7. I like playing video games at a video arcade near my school.

8. I like play computer games at a PC room with my friend.

9. I like singing with my family at a singing room.

10. I like jogging on the playground.

11. I like eating cookies at the school shop.

12. I like looking out the window to view the beautiful scenery.

(Are the sentences grammatical? Would you check them? Thank you.)

What do you like doing in school?

1. I like playing baseball with my classmates on the playground after school. good

2. I like studying at the library on the third floor of the school building after school. I'd take out some of the repetitious words: I like studying on the third floor of the library after school.

3. I like listening to classes at my academy with my close friends. good

4. I like talking with my classmates on the stand. OK, except I don't know what "on the stand" means.

5. I like having a conversation with my intimate friends in the hallway at the break time. (Is it OK? What is the suitable English term for the 10 minutes' break between classes in school?) I'd rephrase: I like having a conversation with my close friends in the hallway at breaks.

6. I like talking the native speaker in the teachers' room at lunch time. I'd add "to" after "talking" - otherwise, it's fine.

7. I like playing video games at a video arcade near my school. good

8. I like play computer games at a PC room with my friend. I'd change "play" to "playing."

9. I like singing with my family at a singing room. Is this "in school"?

10. I like jogging on the playground. good

11. I like eating cookies at the school shop. I'd say "in" rather than "at."

12. I like looking out the window to view the beautiful scenery. good

The sentences you provided are grammatically correct and give good examples of activities you enjoy doing at school. However, I can provide some suggestions for improvement:

1. I enjoy playing baseball with my classmates on the playground after school.
2. I like studying at the library on the third floor of the school building after classes.
3. I enjoy listening to classes at my academy with my close friends.
4. I like chatting with my classmates at the stand. (Not sure what "stand" refers to, you may want to clarify)
5. I enjoy having conversations with my close friends in the hallway during the break time. (In English, we commonly refer to the short break between classes as "recess" or "break").
6. I like talking to native speakers in the teachers' room during lunchtime.
7. I enjoy playing video games at a video arcade near my school.
8. I like playing computer games at a PC room with my friends.
9. I enjoy singing with my family at a karaoke room.
10. I like jogging on the playground.
11. I enjoy eating cookies at the school shop.
12. I like looking out the window to admire the beautiful scenery.

Overall, these sentences convey your preferences for different activities at school. Well done!