I am a student of class 12th and am confused among B.Sc, engineering and architecture. Which one should I choose?

Firstly, try to focus on class 12th boards, because it is the most important prerequisite of any course or any other competitive exam. After that, try to discover in which field you are interested in. You'll surely come out of confusion. And, don't be under the dilemma that some course has less scop

First, it totally depends upon your interest, next is, what you wants to do in future and in which field you want to make your career in. And, if you know these two, then you can automatically find your career option.