You can buy the Official IELTS Practice Materials. They consist of a booklet and an audio CD and contain a complete test for both the Academic and General Training Modules with an answer key.
You can also purchase How To Prepare for IELTS, a comprehensive book providing advice and practice in the four skills you need to do your best in IELTS. It includes a CD-Rom for additional exercises.
You can access comprehensive preparation and practice in every aspect of each of the four parts of the IELTS exam on the Road to IELTS CD-ROM. It contains over 120 hours of learning materials. All the above can be purchased at many British Council IELTS test centres around the world. Please contact your local test centre for current availability