how can one chose which branch to take in MBA

See, it purely depends upon you interest and especially your skills. If you enjoy calculations and love to read about financial and economical activities then FINANCE is the way to go. Similarly, if you're good at convincing people and have confidence to talk rigorously to persuade others then MARKE

Every college offers so many specialisations and specialisations are to be selected in 2nd year so you have enuff time after joining college to decide your field of interest.

if u are good in finance than take finance line.. same as if ur thinking u can do marketing soo u can also go in marketing line...HR is also very good if u can handle people and if u can manage with mass very effectively...

choose the branch in which u specialise meaning in which u have done ur basic courses

It Depends upon your Interest. Else all branches of MBA are best Whether it is HR , Finance , Marketing , International Business , Banking And Insurance.