You do realise your paid for Diploma of Photography is from an organisation that is not a Registered Training Organisations (RTO) and therefore any qualification you get is not a recognised one as per Australian Standards? The real diploma is called 'Diploma of photoimaging' : CUV50407 - Diploma of Photoimaging.
I am sorry to hear your husband is very unwell.
Your question has been asked before on the site, and my understanding is they have given you instructions on how to setup a test to determine the dynamic range of your camera, have you setup and done the tests?