Although this book explains the basic concepts in an easy-to-grasp and swift way, from my own experience, it wouldn't be advisable to rely solely on it. Use it as a template and then expand on the concepts which can be found in more depth in the Understanding Philosophy AQA for AS/A2 Level (AS and A2 are seperate textbooks). By using the two as complementary sources you will be more successful. To be blunt it is a short and therefore shallow textbook, which doesn't really go into enough detail to allow you the highest grades.
If you can afford to, my advice would be to buy this as well as the previously mentioned textbook(s). However, if you're not fortunate enough to be able to dish out £30 on Philosophy textbooks, then I strongly suggest you leave this and go for the more thorough and comprehensive 'Understanding Philosophy AQA for AS/A2 Level'. That will ensure your A grades. If, on the other hand, you aren't too worried about getting those top grades in philosophy (A or B), then Philosophy for AS and A2 goes into ample detail.
Please remember that this is a thin textbook which covers both years of A-Level, although doesn't provide any sections on the texts. Good luck!