Year 6 Science
Properties of Materials
Some of the information on pages 14 to 16 of the Longman's Physics book is relevant, but it goes into much more detail than you need at this stage.
Light and Seeing
(Longmans Physics Pages 34 - 45. You do not need any of the section about how things appear coloured or how colours can seem to change in different lights)
Evolution and Inheritance
(Biology 11-14 pages 152-159. There is a section about Selective Breeding on page 145. The rest of chapter 6 is also about this topic, but goes into much more detail than you need at this stage.)