Hello Pradip,

Yes, you can definitely apply for B.Tech after you have completed your general B.Sc. You can do it so through a scheme called "lateral entry scheme" and it is provided by many of the engineering colleges. It's only for those students who complete a course in engineering diploma or B.Sc.

As per preference, mechanical branch is considered to be the best branch among all as it has a vast area of job opportunities. But it all depends on your interests. If you like working with tools and machines then I would definitely suggest you to go for B.Tech in Mechanical. There are other branches as well like Electronics, Information Technology, Civil. It's upto you what you like.

I hope you found me helpful.