This book has been specifically written for the new two-tier Edexcel linear GCSE specification for first examination in 2008. The book is targeted at the D to B grade range in the Higher tier GCSE, and it comprises units organised clearly into lesson plans. Each unit offers:* Prior knowledge identified at the start so teachers are fully prepared to teach the topic* Teaching objectives identified so it is clear what students need to know* Useful resources suggested, including links to the interactive CD-ROM, to help teachers plan engaging lessons* Practical support for the lesson, including mental starters and plenaries* Exercise commentary so that teachers can differentiate effectively even within ability groups* Worked solutions to past Edexcel questions so that teachers can help students reviseThis guide forms part of a series of four teacher guides at GCSE, in which the other three books cater for grade ranges G to E, E to C and B to A*.