Hey,

If you want to discover your area of interest particularly for selecting the branch in B.TECH, the best thing you can do is to get through the syllabus of the B.TECH course with its branches. Like, you can refer for CSE, Mechanical, ECE etc. By going through it, you will certainly come to know whether you will be able to do best in that branch or not. Moreover, by reading some subjects, you may also get fascinated. Do think about the future prospects of the respective branch, like, what you will do after completing this branch and really you want to do in future by pursuing this branch of B.TECH course. By just thinking and pondering over for some time, you will definitely come to discover about your area of interest.

Hope it helps.