Know your Interest
Do some Research
Know about Post graduation and Work life
The reality is, every branch has good scope and opportunities if you perform well in it. Contrary to this, if you take up a branch just based on its job prospects and lack interest in it, you'll end up getting nowhere.
Source: http://jobs-and-educations.blogspot.in/2016/06/how-to-select-right-engineering-branch.html