help me!!!

Очень много ошибок. к сожалению, не имею времени переписывать все. "you was" звучит дико. Южно -Сахалинск определенно пишется по другому, например, Uzhno-Sakhalinsk... My elder brother was sick. и т. д, и т. п.

Да, на ПРОЕКТ явно не тянет, да и ошибок много.
Basic information about hte school.
I study at school number 23. It is situated on 18, Tihookeanskaya Sreet, Uzhno-Sahalinsk, Russia. The telephone number is ...Далее придётся поправить фактическую информацию, так как я не знаю Вашу школу. Варианты для замены - в скобках, или же свои добавите.
My school is a three(four)-storeyed building. It is quite big with sports ground behind (in front of) it. On the ground floor there are classrooms for the primary school, workshops, a library and a canteen. Our spacious gym is also located on the ground floor. Our physical training lessons are held there. It is equipped with sports facilities, that's why pupils like to go there even after the lessons. There are specially equipped classes for Chemistry, Physics, Biology, History, Geography and English. On the second (third) floor there is a nice big assembly hall, where a lot of meetings, concerts and festivals are held. Our classroom is on the second floor. It faces the school-yard( football field, garden, forest, road)
Comments from pupils.
Sasha Petrov: "I've been studying at this school since the second form(grade). I like to study at this school, because there are very good teachers here. When I think about my school I don't remember its walls and desks, these are my teachers and schoolmates who will be always with me. I am so thankful to our teachers for what they have been doing for us. "
Mariya Kislitsina: "I enjoy studying at our school, because here I get all nesessary knowledge that can prove useful to me in my future life. The teacher's staff is highly-qualified and the classes are quite well-equipped to provide us with profound knowledge and skills. Still there's something I'd like to improve. I mean our English classroom. You see, I'm keen on studying foreign languages. I think they are extremely important nowadays, that's why I would like to have a language laboratory in our school. If we had it, we could master our pronunciation of foreign languages by listeting to different tapes, and it would help us to understand native speakers better."
Kostya Sidnikov: "The most important thing for me in our school is my class. I can't imagine myself being apart from my friends. Our class is very friendly and united. Team spirit and mutual readiness to help are the virtues that are really valuable, or I would even say priceless. I'm sure some of my classmates will be my best friends for a lot of years ahead, or even forever. "
А вот анекдот, который настолько безграмотен, что даже смысл едва улавливается, а уж смеятся точно непонятно, где надо, я бы убрала. Надеюсь, то, что я написала, Вам пригодится!

Замените:
> I like to study at this school, because at this school good teachers.
- I like to study at this school, because there are good teachers
> Why you yesterday was not in school?
- Why wasn't you in school yesterday?
И добавьте Ваше отношение к школе, ваши пожелания, возможно какие-либо изменения, которые вы хотели бы видеть в вашей школе

Нормально, только кавычки надо поставить с двух сторон, фамилию и город с большой буквы. А ещё сказали сколько писать проект? Не мало?