DRpep
The CATS online study guides are great value.No one else has them as far as i know. Found them to be very staright forward. Its like anything, if you have a genuine interest in a particular topic you find it alot easier to digest.
Out of all the subjects, AGK, MET were my Favourites. Different for everyone i suppose.
Waste no time, get online! (did that ryhme!!)