You can register for another IELTS exam and send a copy of registration paper to local CHC and write them immidiately after you will get the result , submit it. Also you send the previous result to them with supporting documents.
Good Luck
You don't have to anything other than submit your IELTS results if the test was taken within 1 year of submitting your application to CIO, it is still valid.
1. Ok, once more. If CIO approves your application, you will get a letter/email telling you to send you application and documents to the processing office. This is when you send you IELTS. If the exam was taken within 1 year of the date you sent you application to CIO Sydney, then it is still valid.