Hello Sanjana !
Bachelor of science (B.Sc) in nursing is a 4yrs undergraduate course.
The average course fees is around 20,000 - 1.5 lakhs per year.
You can consider the following colleges :-
1. Christian medical college, vellore 
Fees - 23,255
2. Sri ramchandra university, chennai 
Fees - 50,000
3. KLE university, belgaum
Fees - 51,000
4. Bharti vidyapeeth deemed university, pune
Fees - 80,000
5. Symbiosis international university, pune 
Fees - 1,70,000
There are many other colleges that you can consider as well.
All the best !