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Кое-что подправила.
My favourite film is Forrest Gump. Of all types of films I prefer ONES with sense. This film is one of them. I ALSO like the acting, especially I like the acting of Tom Hanks. I saw the film many times. It is a drama about the man from the invented city Grinbow, State of Alabama. His name is Forrest Gump. The plot begins WITH the childhood of the main CHARACTER and finishes WITH the scene where he sends his son to school. He’s sitting on a bench in the square and telling the story of his life. His IQ is only 75 but he can run very quickly and it helped him to enter THE University of Alabama. His RUNNING skills helped him to becOme one of the best sportsmen of the USA. After he graduates FROM the university and goes to the army of the USA. He was sent TO war to Vietnam. There he rescues a half of the platoon and becomes a hero. He becomes very famous. He receives Medal of Honor, the highest military award of the country from the president.

P.S. Hero – герой, который совершает подвиг, если хотите сказать герой произведения/фильма.. ,лучше используйте слово character.
Favourite – британский вариант, favorite– американский. Это же касается слов film(брит. ) и movie(амер. )

Favorite

все остальное вроде норм. я бы film заменила на Movie