OET - in Australia , is mostly for medical professionals, I think. It is a bit easier than IELTS. If you prepare well enough IELTS, you can get higher scores in OET, after understanding OET format for 2 weeks intensive. More detail please see OET website. The information would be more than enough. The materials can buy through online from OET center, mentioned in this web site. Type OET in google search, start investigate from OET home page. Everything you will get from there. OET is only useful for application of Nurse/Doctor registraytion. It can not be useful for Uni entry or immigration purpose. If you are smart enough to get all band IELTS 7 and above you might like to avoid it. the web address -
www.occupationalenglish.org I think . Good luck! Dr. Aung Hein ... Sydney.