Hey Akash,
Bachelor of Science in Nursing is a great course and is one of the civilised jobs in the world. Nursing keeps a important place in the medical and healthcare system. This is a undergraduate degree course of 4 years duration.
Eligibility criterias for admission to this course are :
Candidate should have passed 12th examinations with Physics, Chemistry and Biology as compulsory subjects.
One must have scored minimum 50% marks in aggregate in the qualifying examination.
Admission to the course is mostly based on entrance exam conducted by the university or state level entrance exams.
Average fee for the course is different for different colleges, for government college it ranges between 2500 to 25000 per year and for private colleges it ranges between 80000 to 150000.
Some Top colleges offering B.Sc In Nursing are :

• Christian Medical College, Vellore
• Sri Ramachandra University, Chennai
• KLE University, Belgaum
• Symbiosis International University, Pune
• Sharda University, Greater Noida
• Bharati Vidyapeeth Deemed University, Pune

Good Luck!