I want to give a career aptitude test for computer Science field (engineering) as I am confused which field to go after engineering. How?

You must opt for the CS branch, if you are interested in that field, because that will benefit you in future.

You can choose the field which you are interested in. I mean in which you are perfect or getting good output. You have to get a good layout in the computer sciences. If you want you can meet your teacher for more clearance. All the best.