Advise for studying for IAT 2025

I currently in my 1st drop , going to give IAT 2025 . I didn't give IAT this year so I am quite confuse how to study for it.

Here is my strategy about it :

A) Biology: My strongest point, I scored 307/360 in neet 2024 in bio. I have seen the IAT question paper and am fully confident I will be able to scored full in it.

Study strategy: NCERT+ MTG FINGERTIPS + NEETPREP QBANK. Solving about 500 question per chapter.

B) Chemistry: Quite excellent in it. Scored about 93 /180 in NEET 2024 and scoring about 120 in mocks. Confident that I can score decent in IAT if I put in a little bit more effort.

Study strategy: NCERT+ NEET PREP QBANK+ NEET PYQS+ JEE PYQS.

C) Physics: Not good not bad, quite average in it, scored 50/180 in neet 2024 and scoring about 100 in mocks. Have to work a little hard in it.

Study strategy: DC PANDEY+ NEET PYQS+ JEE PYQS.

D) Maths: My weakest point, I am a pcmb student however I have only done ncert for 12th boards and hence have no experience in maths of competitive level.

Study strategy: None

Now I have some Questions, please kindly try to answer them:

A) To get BS-MS at iiser mohali/ iiser kol, what is the safe score I should target? B) Can I score decent score without the help of maths? My mon says I am making a mistake by leaving it, however I am also preparing for NEET 2025 and hence am not able to take out time for maths. C) what changes should I make in my study strategy to score atleast 150 in IAT 2025? D) Is there anyone who is/was struck between the career choice between medicine and research in biology? I am equally interested in both and thus not able to decide between them. If you could share your experience and what you choose between them and why, I will be very grateful to you.