I have read a lot this weekend, almost done the book. Crake and Jimmy graduates in to different schools, Crake went to a school where all the genuis study, and Jimmy went to HelthWyzer. Jimmy was able to visit Crake and have a tour of his school. He watched strange creatures like chickens with no eyes. Crake told Jimmy about the tragic of his father, his father was killed becuase he found secrets about HealthWyzer. This probably led to the destruction and diseases Crake made, he wanted to avenge his father by destroying the foul mankind and creating new perfect humans called Crakers.
As the flashback of Jimmy's life blurr, Jimmy comes back to real life. He wondered around the city as he is the only human on earth now. He found food and Utilities for him to use in an urban area. Jimmy is really lonely and isolated by the world, he tries not to forget anything that the modern world had. Not a single word. If Jimmy forgets something it will be gone for ever.