Hello Chaitanya, Greetings!
The percentage you need to score in your B.Tech solely depends on the course that you’re planning to do in Australia. If you’re planning for an MBA, try to keep your cgpa above 8-8.2 in all semesters. This will help you to get a good college for MBA in Australia.
Also, If MS is your plan after b.tech, I would suggest you try for countries like America or Germany for that as Australia doesn’t have any renowned institutes for MS (as compared to Germany and the U.S)
Hope this answer helps you.
Feel free to ask any more queries that trouble you.
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