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)
sciences, communication, leadership, and critical thinking is required for a bachelor's degree. BSN programs typically last 3–4 years. With a BSN you can work in private medical and surgical hospital, a physician's office, public medical and surgical hospitals, home health care services, and nursing facilities. Having a BSN can result in more opportunities and better salary than just an associate degree.
The bachelor's degree prepares nurses for a wide variety of professional roles and graduate study. Course work includes nursing science, research,
Bachelor of Science in Nursing
The Bachelor of Science in Nursing (BSN, BScN) also known in some countries as a Bachelor of Nursing (BN) or Bachelor of Science (BS) with a Major in Nursing is an academic degree in the science and principles of nursing, granted by an accredited tertiary education provider. The course of study is typically three or four years. The difference in degree designation may relate to the amount of basic science courses required as part of the degree, with BScN and BSN degree curriculums