Akshay, you haven't mentioned regarding which exam are you enquiring. Neverthless, we shall help you with we shall help you with NEET information. But if it is not about NEET, please do let us know and we shall help you with relevant information. Please check our page for chapter wise weightage for NEET in Physics, Chemistry and Biology at; https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics