I urgently need you to revise the following sentences I have to include in an email.

1) Thank you for answering my last email and letting me know you are going to find another theme for our Comenius project with your French partner.
2) As I'm holding a meeting with my colleagues from the English Department this afternoon, I'd like to have a few more details about your school profile.
3) If the students, who will be involved in the project, are only those of the the linguistic branch (specializing in languages).
4) In this case I'd like to know if English is their first foreign language, French their second and Italian or Latin their third.
5) Finally, I'd like to know how many hours do they averagely have of English a week? Actually, we intend to include students from class 13 who study English as their first foreign language.

1) OK

2) OK

3) If the only students involved in the project are those specializing in languages <~~This is a fragment, not a whole sentence.

4) In this case, I'd like to know if English is their first foreign language, French their second, and Italian or Latin their third.

5) Finally, I'd like to know how many hours they have of English on the average each week? We intend to include students from class 13 who study English as their first foreign language.

Here is a revised version of the sentences you provided:

1) Thank you for responding to my previous email and letting me know that you will be exploring other themes for our Comenius project with your French partner.

2) As I have a meeting scheduled with my colleagues from the English Department this afternoon, I would appreciate it if you could provide me with more details regarding your school profile.

3) If the students who will participate in the project are solely from the linguistic branch specializing in languages.

4) In that case, I would like to inquire whether English is their primary foreign language, French is their secondary, and whether they also study either Italian or Latin as their third language.

5) Lastly, I would like to inquire about the average number of English instructional hours per week for these students. Specifically, we are interested in including class 13 students who are studying English as their primary foreign language.