The admission for B.Sc Nursing programme in St. Johns Medical College, Bangalore is based on the entrance test & Interview. It would be difficult to provide you the information about teh required marks as officially there is no any information about it. You can check the further information with the given below link.

http://www.stjohns.in/images/standarduploads/College%20of%20Nursing%20Prospectus%20Final%202018-19.pdf

Good Luck!