Hello Ajay,

For your query related to study material you require for preparation of your entrance exam of B.Sc. in economics, I would suggest you to have a look at previous years question papers and various sample papers available. Do practice them well as the questions often get repeated so it will help you to get perfection in preparing for the exam.

Also you can refer some problem solving assessment books , any of your choice and inter books of physics and maths. You can also refer PSA books for reasoning.

Hope it helps.

Good Luck!