Hello bhoomika,
You choose CS because it is best for you according to me. Civil is not a good choice and after b.tech, in civil there is very less chance. CS has more chance now days.
Here the college predicter tool, click the link and fill required area and oredict your college
https://engineering.careers360.com/kcet-college-predictor
Hooe its helpful.
Thank you.
Application | Exam Pattern | Admit Card | Answer Key | Result | Cutoff | Preparation Tips
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile