Applying to Australian grad school with 3/4 GPA

[GPRW]

Hi,

I am thinking about applying to an Australian graduate program of Actuarial Science (or Actuarial Practice or similar). My GPA is 3 out of 4 in the American system (A, B, C, D, F, etc), how does this score correspond to the Australian system?

Here are a few programs I am thinking about, with their entry requirements normally at around 5 out of 7 or 65% in the Australian system:

http://programsandcourses.anu.edu.au/program/7420XMACTP

http://courses.mq.edu.au/international/postgraduate/master/master-of-actuarial-practice

https://www.business.unsw.edu.au/degrees-courses/postgraduate/masters/actuarial-studies#Entry-requirements

https://www.study.monash/courses/find-a-course/2018/actuarial-studies-b6014#entry-requirements-2

Do you think my GPA can fulfill this overall requirement?

Also, my GPA in the first two years was very very high, but in the last two years, it dropped quite a lot, for a variety of reasons combined. What should/can I do now, since I only have one semester left? 

Best and thank you all in advance,

GPRW