The below links will take you directly to the specification as GryphonScience are far too old to keep printing stuff.
The following link for the entire specification: h420-2015-a-spec
The following documents outline the specification on a chapter by chapter basis. You are expected to print, or have access to them as you are taught each chapter.
Module 5 Communication, Homeostasis and Energy
Module 6 Genetics, Evolution and Ecosystems