Hi mehek,
It is good that you want to choose the branch by having the proper consideration with others. Because many of the student after passing the class 12th choose any of the engineering which they find out fancy for them.
At this stage I would suggest you to look at your favourite subjects and find out what could be best for you suppose if you have computer science in your subject and if you are really able to code the things then go for computer science engineering
For example you have physics chemistry and maths
Look for those topics which you find interesting for you because In Mathematics Physics and Chemistry there are so many topics and your interest could lie in any of those and choose the branch according to it.