This really reminded me of the first part Flowers for Algernon. The main character undergoes a treatment which improves is intelligence and the story is narrated via a series of diary entries which become successively more fluent and sophisticated.
We had to read it in middle school and man did it have me in tears at the end.
Good book, but the film is underwhelming. Saw it fairly recently for the first time.
Had me in tears by the end. One of my favorite books. So glad a friend recommended it to me.