Hi Sir, I am currently doing B.Tech in biotechnology ,but I dont find it interesting and I wont continue the stream further. I am interested to go for MCA after my B.Tech course .( I had computer and maths in +2) .Please give your opinion about this(in future and jobs prospect) !

I also did Biotechnolgy from IIT Roorke though i found it very interesting. But of my friend’s case is same as you. He opted for computer science electives and gave gate after that to do M.Tech in computer science. For that you really need to do interns and all, in computer field that can strengthen your resume.
Do some projects under any prof of CS if possible at your instittue.