If you are interested Networking, Application, hardware and software then you can go for B.tech CSE or IT branch.

After 12th you need to appear for IIT JEE or state level Engineering entrance exam to get admission in top colleges for this branches.

The Eligibility to apply for IIT JEE

You should have minimum 75% in class 12th to get admission in IITs, NITs, IIITs, GFTIs.

The eligibility to apply for state level exams varies state to state.

For further information about you can go through with given below link.
JEE main 2018

A Computer Engineer is someone who would have indepth knowledge about the Hardware systems as well as the Software systems.

IT is more of a Professional track course. You are taught regarding the basic applications of a technology. It makes you an expert at the surface level of the tech, which will aide you to develop skills required at the industrial level.

Good Luck!