How to negotitate for a better hike , HR will surely try to low ball me ?

My current CTC is Rs.3.25 lpa being in customer support as salary is very low in these domains , my journey for product roles are still continue and for a better hike and opprtunity , i have given imterview and i cleared them and my final HR round is on monday where i am damn sure HR will try to low ball me . They usually have a budget of 6 lpa for the role . How should i convince that i should get a salary in the range expected for the program associate role. The thing is i have only 6 months of work ex but i got into customer support just to avoid the career gap but now i don't want to pay the price for it by getting a less than expected hike even when i am pivoting my domain .Help me out guys!!

One more update - My google APM interview is rescheduled for 01st MAY so i am also grinding for that