Even though Critical thinknig is a total waste of time, there is only 1 good revision book. Its called "Critical thinking for Students" by Roy van den Brink-Budgen. (ISBN 1-85703-634-4". Hope thats any help.
Yeah he is the chief examiner so it's good to see what he writes! I didn't find the book that helpful, but as our teacher was another examiner she produced revision booklets for us which were much better. Try to borrow the book to see if you get on with it, or there's no point buying it.