Bachelor of Science in Nursing
I know about that The Bachelor of Science in Nursing (BSN, BScN) also known in some countries as a Bachelor of Nursing
yes 
i have heard course of study is typically three or four years.
yeah i have four years
You should know then that The difference in degree designation may relate to the amount of basic science courses required as part of the degree
 Total degree credit requirement (ranges from 120-129)
yeah and in adtion to that In addition to those courses, experience in physical and social sciences, communication, leadership