IMHO there are two good books that are worth buying. The Kaplan UKCAT book is very good, and relatively close to the actual test. The ISCMedical 600 questions book is also good... A huge number of questions, but perhaps harder than the test itself (especially the QR section). You can get both second hand from amazon (they're the first two on the list if you search for UKCAT). Good luck!
IMHO there are two good books that are worth buying. The Kaplan UKCAT book is very good, and relatively close to the actual test. The ISCMedical 600 questions book is also good... A huge number of questions, but perhaps harder than the test itself (especially the QR section). You can get both second hand from amazon (they're the first two on the list if you search for UKCAT). Good luck!