i studied b.tech in biotechnology and now i want to do MBA but i am confused with what subject i have to proceed?

then choose MBA in biotechnology don't change your track or you will face problem.or go with Mtech.which lead to experience & paid salary.

Since you have a Biotech background you can opt for MBA in Marketing, but it totally depends on your choice and interest which stream you want to pursue. Subjects in finance are Financial & Cost accounting, Analysis of financial statement, International finance, Merger & Acquisitions, Fixed income,

Appear for CAT , You Can not link any of your studied Subjects with MBA , which is mostly an Economics Subject by Nature , How ever you might try opting as per your personal Interest , Like if you like Mathematics you might go for Finanace