Class 12 PCB — Starting from zero, aiming for 70+ in boards (Dummy+Online)

I’m a Class 12 PCB student and honestly, I’ve wasted almost all my time. Now I’m scared about boards. I only want to score 70+ in boards, not 90+.

From today (13 Sept), I’m putting NEET on hold because my preparation is basically zero. I’ll focus completely on boards and think about NEET after boards.

If you were in my position, what would you do? Which teachers/resources would you use for Physics, Chemistry and Biology, and how would you start from almost zero?

Please give me some genuine advice on how to realistically get 70+ from here.