The Question and Answer section for Flowers for Algernon is a great resource to ask questions, find answers, and discuss the novel.
Likely, the page numbers you were given came from a different publication. Page numbers vary in differents issues.
I'm not sure what you mean by writing her better. Do you mean "writing get better"?
Flowers for Algernon is written a journal-like style that chronicles Charlie's life before and after the operation. WE can trace the changes in Charlie's intellect and personality and the effects of the operation through his entries.