Kung naka-BVA kayo ngayon, meaning on-shore kayo and waiting for the grant of Student Visa, right? Since, na-invite for 189, if I remember correctly, you have 60 days to lodge your application.
Ang iingatan natin ay yung magpatong ang 2 grant. Ok lang na maunang ma-grant ang SV tapos si 189, ang iiwasan ay mauna si 189 tapos si SV kasi magiging active ang SV.
Normally nagbibigay ng din BVA si 189 pag on-shore at wala namang magiging problema if you lodge now and be granted another BVA. Once, you're granted BVA by 189, you can now withdraw your SV application and even if the BVA granted by SV becomes void, you have the BVA granted by 189 so no risk of becoming a UNC (unlawful non-citizen).