I need some information on how to get into medical college

No, if the medical school says it requires that you take biology and other sciences to be considered for admission, then you must take those courses. You will be required to submit a transcript of your coursework when apply to prove you have taken the required courses.

There are 5 medical programs in Australia–I’ve linked their international admission pages below.

Here’s the admission page for U of Queensland Ochsner (which is largest graduate medical program for internationals in Australia)
https://future-students.uq.edu.au/study/program/Doctor-of-Medicine-5579

Here’s the admission page for international students at U of Sydney graduate medical education
http://sydney.edu.au/medicine/study/md/InternationalAdmissionsGuide.pdf

Here’s the admission page for international at Monash University graduate medical education–
http://www.med.monash.edu.au/medicine/admissions/grad-entry/2017-entry-international.html
Monash requires that your degree have “significant and broad biomedical science content to be eligible for consideration.”

Here’s the admission page for international students at University of Western Australia–
http://www.meddent.uwa.edu.au/courses/postgraduate/apply-professional/int-std-path/MD
UWA accept just 10-12 international students/year

Here’s the admission page for international students at Griffith University’s graduate medical education program
https://degrees.griffith.edu.au/Program/5099/Courses/International#course-list

All require that your degree come from an approved foreign institution-- you’ll need to register with the AU Dept of Education and Training to have your degree assessed (requires a fee) to see if it meets minimum standards for consideration.

The MCAT test your knowledge of biology, genetics, biochemistry, chemistry, organic chemistry, physics, statistics, sociology and psychology. It is extremely unlikely that you will score high enough for medical school admisison without taking coursework in those subjects.

I am unfamiliar with the content of GAMSAT–but here’s the exam’s home page
https://gamsat.acer.org/gamsat-uk

Here’s a description of the exam: