Overseas students study contained by Australia- Fail surrounded by one subject of the course, the student visa will be cancelled?

Overseas students study in Australia- Fail in one subject of the course, the student visa will be cancelled
Question Details: (1) Overseas (International) students studying in Australia or Aussie please answer:
(2) Due to australia immigration rule, international students who founder in just one subject of the course, and re-take the exam again and even still fails , the student visa will be cancelled and the student have to leave although her study course still not yet finished. correct?
(3) Is it common for international students' visa to be stopped because of this cause?
(4) If the student visa has been cancelled, the student has to evacuate the australia at once and cannot reach aussie in three years' time. Correct?
(5) Anyone who has hear the similar case happened?
(6) I am an international student and think of studying contained by Aussie. I am worried since i am not good at academic study although I will not absent within class, my attendency of schooling might be over 90% but i am afraid if I fail twice in one subject, I will be asked to leave australia. It is a impossible thing and i will feel humiliated.
Answers:   
Dont know

Resolved Questions:
How long does it pilfer for I-485 approval once priority date become current? What is the process after I485?
I-485 is only filed if the person is already within the United States on some other kind of visa. If that's the case it usually takes give or take a few 6 months.

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