Always think, what is your interest, analyze on your interest and work on it.

Branch wise description-
Chemical engineering: - If you had a huge crush on chemistry go for it. As if you like chemical reactions and love the chemistry lab action so it means you are passionate about chemical branch and surely you will have a bright future.

Electrical Engineering: -This needs a special talent - Of imagining abstract things purely explainable by mathematical equations. If you get excited about the idea of developing means to control dynamic processes and power supply grid go for electrical.

Civil engineering: -If want to live your life more practical and experimental means having an interest in rigid body dynamics and passionate of the building go for it but don't think of placements and job before going in it as you can work as a freelancer or contractor if you love your passion.

Mechanical engineering: - If you are good with imagination of 3D objects and have good logical thinking then mechanical is best for you. A very wide job opening as mechanical engineers is found in almost all sections of engineering. The scope of mechanical will be going far better in India in upcoming years.

Computer engineering: - If you had taken cs in 11th and 12th then you are the best person in the world to tell whether you should opt for http://it.It contains the lot of practicals, computer languages, advance level programming and a great stamina to sit in front of computers for hours.

From placement point of view, this is the evergreen branch where jobs are easy to get.

At last, try to maintain good GPA in college this will help a lot in placement point of view.

Hope it helps.