If you are not getting interested in the subjects taught in BSc then you can do it. But this 2 years of your life will get wasted.

Now if the scenario is like you want to pursue BTech for Jobs then you can do a thing. You should complete your BSc and then sit for Lateral entry exams by which you will get a relaxation of 1 year in BTech course i.e., you will get the Btech degree in 3 years.

You can do this too. You should check that in your state there are this lateral entry option is available or not. In Westbengal we have JELET by which the people can get admitted laterally after their BSc.

I hope my answer helps you. All the very best for your future endeavors!