Just make sure you read the book "Ace the IELTS" by Simone Braverman. It's a very good book which helps you score more. You will find it online in pdf format. Just google it.
Please concentrate more preparation on writing, do up a couple of different types of essays so that you are ready to go during the actual test. 1 hour for 2 essays is a really short time!
Here is a thread of mine on Writing. It also has pointers to other resources on this forum and elsewhere.