I'm in last year of B.Tech metallurgical engineering. Which stream should I choose in MBA?

Being a B.Tech graduate, I think operation will be a very good choice for you. Rather than that, it is all about personal choice & interest. In every college, in the first year, you have to study every subject. Then in the next year, you can choose according to your comfortability.

MBA there are highly choosed streams like HR,Marketing,Finance, Revenue Management and many. You need to explore any one in this particular field and then you will definitely succeed in that field.