Hello (name),
Thank you for your letter, im very happy that you like your new school, it looks like some special private school.
Economics is difficult for me, i just dont know why.I just love (name of band), i always go to their concerts, although the tickets are pretty expensive. However, i also like U2, their my second favourite band, they came to my town a couple of weeks ago.
I have to go now, ive got alot of homework to do.
Send me a letter when you find time.
With love,
(name).