Go to http://www.sparknotes.com/lit/mocking/ to get a complete summary of the book plus detailed explanations of happenings in each chapter.
It's been a while since I've read the book so if I write one, it won't be as accurate. Plus, I will be posting a really long answer if I decided to write one here anyway.
Sparknotes is a great website for any sort of reading help you might need. It seriously saved my butt in AP Literature and Composition during junior year (of high school). Why don't you give it a try.