hi friend
chem is a bit similiar to what u think
civil requires much field work(probably in the 4th yr)
biotech requires little aptitude 4 bio-has a great future.
have u appeared in kiit exam? well the brochure(small one)of kiit contains some details about the topics that are taught in the btech courses.
take the stream which u find a bit interesting.
rate me if u find useful.