I'm currently studying AS level psychology with the exam board OCR. This enourmous text book by Richard Gross is an ideal companion for the course I am currently studying... if you can be bothered. This book is fantastic and full of detail. I know this having read excerpts dished out by my psychology tutor. We were told to buy the text book for reference and 'light reading' at home. This, however, is anything but light reading! I'm not saying this book isn't good or useful because it is, really, it is. However, the amount of detail needed for AS psychology is only a small amount in comparison and I have found that my Gross text book has been sat on my shelf unread for a year now. I spent almost £20 on this text book for my studies yet it was very unneccesary.
My advice to any students in my situation out there: Don't buy the book... there are other means of discovering the information you need such as FREE websites like www.holah.co.uk which covers every study in Gross' book for free, granted they are in less detail, but there is enough to get you the top grades on the course! Trust me, I've been through it!
Nevertheless, if you must get this book then i suggest you buy it second hand, I'm sure there are alot of AS psychology students out there with an unread Gross book on their hands who are willing to sell for cheap. I'm one of them!
This is a worth while book if you are truly interested in the 'Key Studies in Psychology'. However, if you are simply a student in search of a good grade, use a website - it won't cost you £20.