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This book has got everything you need for triple science, biology. Personally I hate biology and I find it quite hard, because there are too many things to remember whereas physics is basically maths. My school told us to buy this revision guide. I'm not sure about the market price because I bought mine from the school which is about 3 pounds. Which is quite reasonable for a revision guide like this. There are all the things you will need to know for the exam, if you remember everything in the book, you can be sure that you will do really well in your exam. All the key words are highlighted and the definitions are written near the key words. At the back of each chapter, there's a revision summary question what is one of the best things about this book because you gets to see how well you have grasped the topic and where you need to work on. At the back of the book there isn't an answer page for the summary questions, so you have to go back and find the answers in the text, this is really helpful because while you are looking for some answers you are actually reading it back so you can remember it a lot better. I love the way how they put a joke in each page or a couple because they are like stress relievers to me. I find revisions boring and dry but with the jokes I can concentrate better. Overall this is an amazing revision guide, but be careful that this is for AQA only, if you are using other exam boards you should look at other, but if you are doing AQA this revision guide is God.