Dear Ashlesha, after BSc nursing you have to give AIIMS MSc entrance exam.

AIIMS M.Sc. Exam is a national level entrance exam conducted every year for admitting aspirants into the Post Graduate science courses offered by the All India Institute of Medical Sciences, New Delhi and its affiliates. It offers various courses in M.Sc. (Nursing), M.Bio-tech and other M.Sc. programs.

AIIMS 2l M.Sc. exam is an objective type exam. The exam will consist of 90 multiple choice questions to be answered in 90 minutes. It is a computer based test i.e. mode of the exam is online. 

You can visit the official site of AIIMS for more information - 

https://www.google.com/url?sa=t&source=web&rct=j&url=http://nursing.aiimsexams.org/&ved=2ahUKEwjnyrj_7aLjAhVVk3AKHfoCBe8QFjAAegQIBBAB&usg=AOvVaw1cmx-VDiI57MGd0Ir5kB5K&cshid=1562504465592

All the best 

Hope this helps