Hi jdad84,
Thank you for your reply.
When I contacted the place im working next year, they have already lodged their nomination and waiting for a TRN number for me to fill in my online form.
On the online immi account , I just fill out the health declarations and it tells exactly what tests I need to do for specific type of visas. It also gives a code for me to book an appointment with the clinic. With the online health declarations, you could do medical assessment prior to lodging your visa.
My student visa is still valid till March 2015 and I was told that I could still work without a working visa initially. But I am afraid that this process is gonna take too long and if worse become worst they might just reject my visa application based on my medical history. However, the hospital is happy and has no concerns about my medical history whatsoever until now.