Lonsdale revision guides, the essentials of GCSE Design and Technology: Resistant materials. Brian Russell. There is also a student workbook that accompanies this book.
Unfortunately, there are no published revision guides for Home Economics. However, it is recommended that students purchase a copy of the textbook which is used in class: WJEC Food and Nutrition: Bethan Jones and Victoria Ellis The books are approximately £20, but it is possible to purchase second hand copies for a better price.