I've currently completed 3 semesters, do you think it will be beneficial for me to have completed more? (or would it only be beneficial if I could increase my GPA by a significant amount?) If I did do exams at the normal time however, it would be mid November and GPA thus wouldn't come out till december sometime, would that be too late to be taken into consideration for some unis anyway?
The further you are in the degree, the lower the GPA requirement is. For GWS students 1 year or more but uncompleted undergraduate (8-23 units) GPA = 5.5 and after that they have thresholds at 3 years or more, which isn't relevant to you anyway, so if you are GWS 5.7 is above the hurdle. Receiving results in December is no issue as that is the normal time for all unis.