B.Sc Nursing is a 4year undergraduate course and candidate who completed their 10+2 in PCB with atleast 50% are eligible to apply and  many universities conduct their own entrance examinations, and some universities admit students based on their 10+2 score.

To know about Nursing job, salary and many related information about B.Sc nursing kindly check the following page,

"Nurse - Career, Role, Education, Jobs & Salary" https://www.careers360.com/careers/nurse

Hope this helps.