Need Desperate Help

Hi, I am in class 12 recently I have been preparing for IAT it is pretty rough. My father is asking to take a drop as he's sure I won't make it up for first. Here are the questions I need to ask. Also two months I have already devoted to the prep any help would be appreciated.

  1. How do I need to study as a regular school-going boy

  2. how much do I need to study per subject to what level

  3. what materials do I need to prepare for it should I buy sciastra course or can anyone send me a pirated version of it

  4. can I still crack the exam only after 8 months can I still get IISc?

  5. To assume my preparation level in physics and chemistry I can do till Mains level, Maths of NCERT level