I urgently need you to check this sentence. Thank you.

1) In section F.4 concerning "integration into ongoing activity" our coordinating partner mistakenly wrote that our tenth classes instead of our eleventh classes, which correspond to the third classes in Italy, will be involved in the Comenius project.
2) The participating students will also develop their ability to use IT, which (as a subject) is included in the class curriculum and will solidify their scientifc knowledge in using English as a medium of communicating scientific knowledge as outlined in CLIL objectives.
3) Actually, I wanted to say that both IT and English are present in the class curriculum. English, however,will be used a medium ........

1) In section F.4 concerning "integration into ongoing activity," our coordinating partner mistakenly wrote "our tenth classes will be involved in the Comenius project" instead of "our eleventh classes ...", which correspond to the third classes in Italy.

2) The participating students will also develop their ability to use IT, which is included as a subject in the class curriculum and will solidify their scientifc knowledge in using English as a medium of communicating scientific knowledge as outlined in CLIL objectives.

3) Actually, I wanted to say that both IT and English are included in the class curriculum. English, however, will be used a medium ........

1) To check the sentence, you can start by looking for any grammar or spelling errors. Here is the revised sentence:

"In section F.4, concerning "integration into ongoing activity," our coordinating partner mistakenly wrote that our tenth classes instead of our eleventh classes, which correspond to the third classes in Italy, will be involved in the Comenius project."

2) As for the second sentence, here is the revised version:

"The participating students will also develop their ability to use IT, which is included as a subject in the class curriculum, and solidify their scientific knowledge by using English as a medium of communication for scientific knowledge, as outlined in CLIL objectives."

3) Regarding the third sentence, here is the revised version with the missing part filled in:

"Actually, I wanted to say that both IT and English are present in the class curriculum. English, however, will be used as a medium of communication..."

Please note that the missing part of the sentence is not included in the question, so I've replaced it with "..." to indicate where you can continue the sentence according to your intended meaning.