Hello Aspirant,

The Eligibility Criteria for MBBS course is that you must have completed 12th level of education with Physics, Chemistry and Biology as compulsory subjects. The minimum score requirement may vary but General candidates must have scored at least 50% marks in the Intermediate examination. So yes, you can join MBBS after B.Sc Nursing but not lateral entry though. And as of now , there is no option of lateral entry to MBBS possible in India. Hence to get admission in MBBS you need to clear NEET exam. To get government colleges ,you need a score of at least 500 and above if you belong to  general category. Cutoffs will vary according to category.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/articles/mbbs-admission-in-india/amp&ved=2ahUKEwjK59zCopTuAhWXxDgGHUiLCu4QFjAAegQIARAB&usg=AOvVaw06lVDbnS__UgJUT0ZrRZsz&ampcf=1

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/courses/mbbs-bachelor-of-medicine-bachelor-of-surgery/amp&ved=2ahUKEwjEwa7fopTuAhVfxzgGHYQFDWQQFjABegQIAhAG&usg=AOvVaw0OQArmN0TiiMyRMWltoWME&ampcf=1

All the best