Dear Joe Fred(:,
How are you?Thank you (to write)~FOR WRITING~to me.I know a lot (of)~ABOUT~you and I tell you something about me.I am in a big school.There are
2432 students in my school,54 classes and 149 teachers
(in it).There are forty-three students in my class.They are very friendly.Our classroom is big and bright.I like Chinese very much.I study Chinese very well.I study English very well,too.(Our class is) OUR CLASSES ARE~from half past seven a.m.to five o'clock p.m.My school is beatiful.I like my school.Please write to me soon.
Yours
(in it)应该改成 ARE IN IT.
或者把整句话改一下.
There are 2432 students ,54 classes and 149 teachers in my school.