What are some examples of how Jem Finch changes from the beginning of To Kill A Mockingbird to the end?

If you do a search for To Kill a Mockingbird here in the Yahoo Answers search window you will find that hundreds of questions have been asked here about the novel and those Q's and A's should help you. Additionally do a search for "study guide for TKAM" and you will find many free resources to supplement your work with this book. Best of luck with it.