Hi Pradeep / all,
I'm also a student pilot at about your level of experience. In addition, I'm an immigrant (recently gained my PR visa) and I'm hard of hearing (I'm only just within GA's Class 2 medical standards, but I've now switched to RA). So I have all the problems that you and others have mentioned before.
Yes, "Aussie-English" is a difficult language to decipher (even for native Aussies!) but with practice and some patience it can be learned. Then again, almost any accent of English is difficult to pick up quickly, even "English-English" because it is not a tonal language like Thai or Japanese (I have a limited command of both).
Voice recognition software fails to work properly for this very reason (I really, really dislike those voice recognition systems on some companies telephone systems).
For me, the golden rules of verbal communication is to know what you're going to say before you do and speak audibly, slowly and clearly. Of course, you must follow the rules and use standard aviation phraseology, too.
It all comes with practice but, if you haven't yet mastered it, never be afraid to ask your fellow aviator or ATC to "Say again".
Cheers and enjoy your flying. I know I am.