For anybody taking Edexcel Chemistry at AS-level, this book is a must-have. The standard issue NAS books (those skimpy green things) are awful: they are full of incoherent detail and poor explanations. This book, by George Facer, is clear and concise and sticks exactly to the Edexcel AS syllabus. I appreciated how the book was organised in sections which complemented the syllabus, making revision effective and easy. George Facer uses model-answer definitions and provides down-to-earth and easy-to-understand explanations of all the key concepts. The sample questions and mock exams are perfect and accurate of the actual difficulty found within the exam papers. The full colour and user-friendly layout make this the best Chemistry book produced. Boost your AS grade and get this book!