This is a brilliant revision aid for anyone studying Statistics 1 under the EDEXCEL exam board. Having found out about these from a fellow class mate, I decided to purchase it as I found that I didn't agree with my teacher's teaching methods, and so this was my learning tool for 2 months before the exam.
It displays all the information you're going to need in a few condensed pages including some further examples and extra questions for you to try once you've exhausted the normal Statistics 1 book from the same producers. The extra examples and questions really are very useful, which can lead you to understand the subject much much better than you would if you were just looking at the normal text book.
As for the proof of how good it is, well I can say that I managed to get 100% on the exam with the help of this book - considering I didn't understand the subject 3 months prior to the exam. So this is a must have for anyoen studying S1 and needs any extra help with the dreaded subject that is S1.