I have done B.Tech from 2012-16 but couldn't complete it by now, how can I go for 1-year B.Sc?

Clear your backlogs for B.Tech, if that is why you can't complete B.Tech. B.Sc in one year is impossible to complete.

Hi, You have done a big mistake by dropping B.Tech, it has more value than B.Sc, and you cannot do two courses at same time.

It is a big mistake to drop B.Tech, because it has more value than B.Sc, and you can't do 2 courses at a time. All the best for your bright future.

You cannot do two Bachelor's degree at the same time. If you want to do B.Sc, so you have to shift from B.Tech to B.Sc course, but my suggestion, is complete your B.Tech, because it has more value than B.Sc.