Very good! Another friend has also corrected the entry. Just a few comments that can make this text look more nativelike:

1: Consistency in terms of the formal style or informal style of writing. می خونم و می خوانم

2. There is a subtle difference between "آن ها معلم های مدرسه هستند" و "آن ها معلم مدرسه هستند"  

So if you use the plural "teachers" it would mean that the teachers of a specific school. For instance, you are standing inside a school, or you have been talking about your children's school, then  you would say "oh, look at them آن ها معلم های مدرسه هستند"

But if you just refer to the professions of some people like your parents or friends, you don't need to make it plural:

پدر و مادر من معلم مدرسه هستند

The difference can be realized in the following English sentences:

They are schoolteachers. (For this use, we don't use a plural noun)

They the teachers of the school. (in this sense we use the plural noun)

Just like the following sentences: 

Those are books. اونا کتاب هستن

سلالم!