I selected 5 sentences as promised. I really hope the others were correct!

Sentence number 6 refers to the Italian grading system which I don't know how to express in English.

1) During the break I go out in the courtyard.We aren't allowed to smoke or run in the corridor.
2) I go to football training twice a week. On Saturdays we play a match against other local teams.
3) We have a one-hour English class (or one-hour English classes) (on) three days a week.
4) I prefer scientific subjects such as physics and maths to humanities.
5) We are tested orally twice a term and we get three written marks each term (is there a better way of expressing it??).
6)Each school year is divided into two terms. At the end of each term students get a school report. In the first term they get two average marks,: one resulting from the average of his oral tests and one from the average of his written test.

1 - space after the period

2 - comma after "Saturdays"

3 - fine, either way

4 - comma after "subjects"

5 - comma after "term" -- the rest is fine.

To express sentence number 6 in English, you can say:

"In the Italian grading system, each school year is divided into two terms. At the end of each term, students receive a school report. In the first term, they receive two average marks: one based on the average of their oral tests and one based on the average of their written tests."

To get the translation of the Italian grading system into English, you can use various resources:

1) Online Translation Tools: You can use online translation tools like Google Translate or DeepL to directly translate the Italian terms into English. Simply enter the phrases you want to translate and select the desired output language.

2) Bilingual Dictionaries: Refer to a bilingual English-Italian dictionary to find the translation of specific terms related to the Italian grading system. Online dictionaries like WordReference or Oxford Language offer reliable translations and explanations.

3) Language Learning Resources: Language learning platforms like Duolingo or Rosetta Stone often provide explanations and translations of specialized terms related to various topics, including education.

4) Consultation with a Language Expert: Consult with someone proficient in both Italian and English, such as a language teacher or native speaker, who can explain the Italian grading system and help you find accurate translations.

Remember to cross-reference the translations from different sources to ensure accuracy and context-appropriateness.