NEED HELP SOLVING HARD PROBLEM

Guys I am right now in vmc coaching preparing for advance27 nd I feel like my mains is going a little smooth but advance god damnit. I cant solve advance level question. SOME of you might know about vmc part a part b system i am not able to solve part b at all. THESE questions are very hard and goes above my head

Please need yall help how are you doing it any extra book that makes concept from mains to advance how should i go through

Please Helpp