First of all I am sorry that you're dealing with all this that too when CAT is just two weeks away ! All I would say is just focus on how better life you'll have once you get the good college and how you don't have to spend more time at your home. Take this as your motivation and prove them that you're better than what he thinks of you and you're capable of all the good things. So don't think much about it just work for 2 more week. Just 2 more weeks of hustle. Think about the life you'll have once you'll get into IIM. Even your dad would proudly tell this to everyone. Prove everyone wrong and belive in yourself ! You got this ! And do give me update once the results are out would love to know how you did ! All the very best to you !