I found this on page 1 when charlie said "I hope they use me."
It states this on page 6 when charlie says "I beat Algernon!"
This information is on page 18 when charlie says "Algernon died two days ago."
In the begining of the story charlie wantes the operation done to him because he wants to be smart, beat algernon, and help other people all around the world.
Durind the rising action of the story charlie gets the opheration and doesn't feel it but he is getting smarter you can tell because he beats algernon and that was something he couldn't do before the opheration
In the climax of the story after charlie beat algernon, Algernon started to lose his intellegence and starts being less cooperative and soon dies.
Kind of leaning twords the end of the book Charlie relizes that both him and Algernon had the same surgery so he know that he will start to lose his intelegence and might even die like Algernon did and soon he also starts to lose some of his intellegence just like algernon did.