Read your book backwards.
Rather than trying to read your book through from the beginning, start at the end. Read the last page of the final chapter first, and work backwards. If there’s anything on the page that shouldn’t be there, chances are you’ll spot it.
Flip through your story and see if there are any pages of solid text. It’s all about your characters. The story needs to be revealed through what the characters say and how they act. Too much description will turn it into an essay. Break them up into smaller chunks of description and let your characters do the rest of the work for you.
Most importantly: Without characters, there is no story. Make sure your tale is character-led, and not simply a list of events.
I'll be posting more tomorrow so make sure you come back for the finale