Hi Jyoti!

Instead of searching for specific questions, I would suggest you to focus on "the most important topics" more. We cannot give you a specific set of questions since the pattern changes every year. 

I have listed some important topics from all subjects, focus on these a bit more but still try to cover all topics. Practice MCQ's, last year question papers and questions from books like MTG. 

Important topics for Physics

• Mechanics
• Modern Physics
• Electrodynamics
• Heat and Thermodynamics
• KTG
• Optics

Important topics for Chemistry

• Organic Chemistry- II
  
• Inorganic Chemistry- I
• Chemical Bonding
• Physical Chemistry-II

Important topics for Biology

• Ecology
  
• Genetics
• Molecular Basis Of Inheritance
• Plant Morphology

Please remember that these are just assumptions based off previous years papers.