My school

When I visit my parents and go by my school, of course, I have only nice memories about school life. I remember my school friends, lessons and teachers.

Pretty good writing here. A few spelling mistakes, some grammatical errors and a few sentences that sound unnatural, all things to be expected (and certainly a lot better than my Russian, I think I know 4 words). 

Here are a few definite changes I would make:

"It was so long ago when I visited my school last time". "Visiting" tells me much more than "was in" which basically just means you were in the building and didn't necessarily do anything else. Although I understand what you're trying to say, don't leave me guessing.

"The school is located next to my childhood home". Unless you had horrid parents, "home" tells us everything we need to know.

Everything else, you can leave as is. You could make some other changes if you want to, I'll leave that up to you to ask.