This book is good for AS maths, with good layout.
Also, on the topic of mistakes, those books were renewed after the massive amount of mistakes were found. We saw loads of mistakes at the start of the year, and our teachers complained. New ones were posted to us, renewed, and now all the answers (for questions that I have done anyway) are right, and I found my exam, which was on monday, a breeze with the help of this book, and the revision book that's also made by heinemann for edexcel, which I would HIGHLY recommend for people next year.