Can you please advise the selective school or school offering scholarship program and how to go about preparation for these exams?

Here are the links for selective schools or private schools offering scholarship programs:
http://bettereducation.com.au/Resources/SelectEntryTestFormat.aspx
http://bettereducation.com.au/SelectiveSchools.aspx
'10 ACER scholarships test dates
'10 EduTest scholarships test dates
'10 Allwell scholarships test dates

Each listing/table is sort-able by clicking its headings. You can sort the listings by State, School, Suburb, Program/Scholarship and Test Date. Keep in mind that you need to apply for the scholarship test at least one week before the test date. To find more details of the school, click the school. Most of the links will redirect to the corresponding school listing page.

Using the listings, you can also find the schools which offer scholarships by sorting the states and suburbs.

How to go about preparation for these exams?
Preparation and practice is the key. Parents need to be involved and invest lots of time. If parents don't have time to tutor/coach their children, they need to find a private tutor or a coaching school with classes specializing in selective school entry or scholarship tests.

You can find cheap, second-hand, past test papers or practice test papers for entry into selective schools here.

Hope this helps.

Thanks for sharing
Keep it up:)