Prośba o sprawdzenie - list formalny

Cześć! Bardzo Was proszę o pomoc w sprawdzeniu poprawności listu formalnego.

Dear Sir/ Madam,

I am writing to you In connection with the advertisement for your language school published in „Daily Mirror”. I would appreciate it if you could send me some additional information about your courses.

I am a 18-year-old student from Poland and I would like to improve my English, because I am thinking about living in Irleand. My English level is intermediate, but I need to repeat some grammar and vocabulary, so I am interested in pre-intermediate course at your school.

I would like to ask you for more information about prices of lessons and I would like you to send me a brochure about your school. Could you informed me, too how many members English group contain and from which countries are students the most frequently?

I would appreciate a reply at your earliest convenience.
Yours faithfully.
XYZ

Z góry dzięki!

I am writing to you 'In' (mala litera) connection with the advertisement for your language school published in THE "Daily Mirror".
'Irleand' (ortog).
Could you 'informed' INFORM (czas teraz.) me, too how many members THE English group containS and from which countries 'are students the most frequently' (cos tutaj nie tak,moze, ...the students most frequently come)

Chodzi o to, żeby zapytać w tym liście z jakich krajów najczęściej pochodzą uczestnicy kursów.