How we can study with intrest ?

I beg to differ on your view. The one who learns a subject on interest fares well than a person who studies to apply it and not on interest. You will know applications of a topic by learning. When you have interest, automatically you will see where it is applied.

If only you had the option to study those subjects that interested you - then you wouldn't be asking this question, Ottaplackal. That is why University is so great. I don't know what level of studies you are referring to, but I do know that University-level studies is a whole new ball game. If you select wisely, then you won't know how time flies. Coz you'll be too busy enjoying what you are studying and being interested in it too. Good luck.