Australia

Mostly all colleges in USA requires GMAT, TOEFL/IELTS and minimum work experience of 2-3 years.
In Australia, you just need to get 6.5 overall
Band score and work experience too to get admission.
Best of luck for your future

Yes after Bachelor's in commerce you are eligible for M.B.A

Which course, university, which level Bachelor's or Masters ,PhD or PostDoc

If you are looking for early employment, go for diploma otherwise degree. I would suggest you to go through the skill shortage list of Australia and then make the choice. Also, the cost factor plays a major role in it.

Hi Prakyath, both the courses are different. Decide what interests you the most and study accordingly. For requirements you must check university websites as it differs. No entrance tests are required as such for admission into Australian universities. You must but give IELTS. For PG studies a score of 6.5 and higher would be required.

Hello Gurdeep, since it is not possible to list out all the changes, please check
https://www.border.gov.au/about/corporate/information/forms/changes/summary-of-changes
https://www.border.gov.au/about/reports-publications/reviews-inquiries/student-visa-programme/simplification-of-the-student-visa-assessment-level
The official immigration Australia website.
Regards

B.Sc Micro and Bio chemistry courses are common and there are many colleges that offer these courses. But agricultural engineering is a rare branch , only few institutions conduct this course. So its more demanding course than Bio chemistry and Microbiology
Agricultural engineers have opportunities in agricultural research centers, universities , large scale nurseries, plantations etc.

Yes a bit because canada has wider market than australia. moreover working population in canada is lesser than australia. saying this I do not mean that australia is complete no. in case you have relatives in australia, they may recommend and it may work in australia too, just that a lil difficult.