When the classroom door opened, everybody went silent. It was a rainy day, you couldn't see a thing throught the window. Everybody was suffering from cold, even that guy in corner with two jackets. But even thought coldness piercing our bodies, we couldn't not notice(nie moglismy nie zauwazyc) teacher that appeared in doors. He was really angry about something. We knowed that this will reflect on us. fortunatly, i was prepered for being ask - i had been lerning whole last day. Teacher had taken hes seat and opened class register. Now nearly whole class was shaking not only becouse of cold, but also becouse of fear. Agata was the unlucky one. Badly, she wasn't prepared. Its obviously how that ended - she got F, and that means she wont graduate. Agata was almost crying, we tried to console her, but ineffective. That was really sad picture. Bell had ringed and we run out of the class. Weekend had started.
Highlighted your glaring errors.
AnonymousWhen the classroom door opened, everybody went silent. It was a rainy day, you couldn't see a thing throught the window. Everybody was suffering from cold, even that guy in corner with two jackets. But even thought coldness piercing our bodies, we couldn't not notice(nie moglismy nie zauwazyc) ____ teacher that appeared in doors. He was really angry about something. We knowed that this will reflect on us (What do you mean?). fortunatly, i was prepered for being ask - i had been lerning whole last day. (article) Teacher had taken hes seat and opened class register. Now nearly (article) whole class was shaking not only becouse of cold, but also becouse of fear. Agata was the unlucky one. Badly, she wasn't prepared. Its obviously how that ended - she got F, and that means she wont graduate. Agata was almost crying, we tried to console her, but ineffective. That was really sad picture. Bell had ringed and we run out of the class. Weekend had started.
too bad you only marked my mistakes - but you didnt corrected them.

i will write corrected sentences, and someone - please tell me am i right :]

and also correct those one, i didnt.

correcting that what i just wrote is nice too.

guy in corner ---- guy in the corner
But even thought coldness piercing our bodies ---- But even though coldness pierce our bodies
we couldn't not notice --- i wanted to use double denial there... is that possible in english? and how to use it correct?
teacher that appeared in doors ---- teacher that appeared at door
We knowed that this will reflect on us ---- we knew that this will affect us. is "that this" build correct? would "we knew it will affect us" be right?
i was prepered for being ask ---- dunno.
i had been lerning whole last day ---- dunno.
and that means she wont graduate ---- dunno :>
Agata was almost crying ---- dunno

Bell had ringed and we run out of the class ----
bell rang before we ran out of class, so why "had" is also marked as wrong?
Teachers: We supply a list of EFL job vacancies
Here is how I would:

When the classroom door opened, everybody went silent. It was a rainy day, you couldn't see a thing through the window. Everybody was suffering from cold, even the guy in the corner with two jackets. But despite the coldness piercing our bodies, we couldn't help but notice the teacher who had appeared indoors. He was really angry about something. We knew that this would be taken out on us. Fortunately, I was prepered to be quizzed - I had been studying the whole day prior. The teacher had taken his seat and opened the class register. Now nearly the whole class was shaking; not only because of the cold, but also from fear. Agata was the unlucky one. Unfortunately, she wasn't prepared. It's obvious how that ended - she got an F, and that means she won't graduate. Agata was almost crying. We tried to console her, but were unable to. That was a very sad picture. The Bell rang and we ran out of the classroom. The weekend had begun.