The Question and Answer section for Flowers for Algernon is a great resource to ask questions, find answers, and discuss the novel.
Charlie wanted to learn even though his intellect was challenged. This says that Charlie had a desire to learn and better himself.
The Thematic Apperception Test, or TAT, determines what a person's responses reveal about them through their emotional responses to pictures. It is very much like a Rorschach test.
Charlie is showing them to be lazy and uninspired workers. Charlie is coming up with better more efficient ways of doing things. He also sees the bad things workers do on the job.