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Dear ...
Thanks for your letter. It was great to hear from you. I’m fine. I’m passing my exams next week. 
I'm very happy for you. In your letter you asked me about our friends. (можно добавить какие-нибудь новости о друзьях) And so last weekend I met friends the cafe and we went to the cinema. We had a good time. 
How I envy you! My lot is not so pleasant, for I am obliged to stay at home and prepare for the examinations. I get up at seven o'clock and study an hour before breakfast. Then I continue my work until dinner time. After dinner, which is usually at 3 p.m., I have a nap, and if it is clear I go out for a little exercise. In the evening I read my text-books until it is time to go to bed. 
It's great that you are going to come. I'm looking forward to seeing you . 
Yours truly, 
....

Кэти · Accepted Answer

Dear ...
Thanks for your letter. It was great to hear from you. I’m fine. I’m passing my exams next week. 
I'm very happy for you. In your letter you asked me about our friends. (можно добавить какие-нибудь новости о друзьях) so, last weekend I met friends AT the cafe and we went to the cinema. We had a good time. 
How I' M ANGRY WITH you! My lot is not so pleasant, for I am obliged to stay at home and prepare for the examinations.(ЗДЕСЬ НЕ ПОНЯТЕН МНЕ СМЫСЛ ПР-НИЯ) I get up at seven o'clock and study FOR an hour before breakfast. Then I continue my work until dinner time. After dinner, THAT usually BEGINS at 3 p.m., I have a nap, and if it is clear, I go out for a little exercise. In the evening I read my text-books until it is time to go to bed. 
It's great that you are going to come. I'm looking forward to seeing you . 
Yours truly,