Khalid,
Q1&2: In your Case you do need IELTS test, If your study was conducted in English Language.You just need to submit evidence showing that.
Q3: ANS is not subject to passmark and points calculations. This is a permanent visa. Your qualifications should be assessed by suitable assessing authority.
Q4: see Q3
Q5: See Q3
This visa allows you and any dependent family members included in your visa application to live as permanent residents in Australia.
Australian permanent residents can:
* live and work in Australia on a permanent basis
* study in Australia at school or university
* receive subsidized health care through Medicare and the Pharmaceutical Benefits Scheme (PBS)
* access certain social security payments (subject to waiting periods)
* be eligible for Australian citizenship (subject to the residency eligibility criteria)
* sponsor people for permanent residence.
Fadel Fawzi
http://icuimmigration.com