This book does the job and follows the specification set by Edexcel but is not actually produced by Edexcel, only endorse by them. I recommend buying the purple book made by Edexcel as it's where they get the mark scheme from and is both thinner and cheaper! But you won't be left in the dark if you have this one instead.
Clear, logical format for students to prepare for examinations. It goes further than the basics in some topics which is helpful and interesting. The methodology and invesitgative sections are very well presented.