7.0 comes from this:
http://www.gemsas.edu.au/wp-content/uploads/2012/09/GEMSAS-GPA-guidelines.pdfIn this GPA, first year is weighted x1, second year x2, third year x3. No subjects are removed from the calculation.
GEMSAS GPA = 7.0 GPA.
SGPA comes from this:
http://policy.unimelb.edu.au/MPF1053In this GPA, all years are weighted the same but the number of points a subject is worth is taken into consideration for weighting. The two lowest subjects from either second or first year are removed. Alternatively if you are a Biomedicine student and you did poorly in a second year subject worth 25 points that single subject can be removed.
I will quickly address the term "weighted" from this policy, even though I know you're not confused by that part as some people get confused and it might be beneficial for them: Weighting refers to 12.5 or 25 or even 50 points (as some subjects are) and the relevance of that. So, a second year Biomedicine subject worth 25 points counts twice as much as a 12.5 point subject in a Biomedicine degree. But second year subjects are not weighted more heavily than first year subjects in terms of SGPA. Only for a GEMSAS GPA calculation (and potentially other degrees, I'm not sure what other GPAs courses use, but let's just consider SGPA vs GEMSAS GPA for now).
SGPA = GPA /100.00
SGPA and GPA can mean the same thing...I wasn't trying to distinguish between GPA and SGPA I was distinguishing between GEMSAS GPA (/7.0) and SGPA (/100) that's all. Sorry if that wasn't quite clear!

And when I said something about a GPA not being relevant to what you want to do I was referring to the fact that you've stated you're not interested in Medicine so the only thing that applies is the SGPA out of 100 presuming you are applying for Honours. I'm not entirely sure what postgrad course you want to do though so I could be wrong about it using an SGPA at all.
SGPA is definitely a calculation out of 100. It might not say it in the policy but it is a calculation down to 2 decimal points. I know, because it was used in the calculation of my own GPA for Honours and for awards and for whatever else we are discussing. If I apply to Honours the GPA they will get is 94.8x (I can't remember the last point) and if I apply to Medicine next year and I only get H1s in Honours my GPA will be stated as 7.0. That's because in this degree I never got anything below a H1, though I did in a previous degree that is removed from the calculations as of next year. So it's near impossible to have a perfect SGPA (I wonder if anyone in the history of time has ever done it!) but it's very possible to have a perfect GEMSAS GPA for health postgrad course applications. Does the anecdote help? 3:
What did the Science Student Centre say that contradicts what I said? It's definitely a 4 digit number within the Micro/Immuno department for Honours. I know for PhD it no longer includes your second and first year marks but your third year scores and Honours scores are considered.
------
Where do you guys go on your fieldtrip? Dandenongs or something? It sounds nice!