You should have minimum 45% marks in your 10+2 examinations for joining General Nursing and Midwifery course. The duration is 3 and 1/2 years.
There are specializations in nursing career also. Some are listed below
Nursing Superintendent (NS), Assistant Nursing Superintendent (ANS) Nurse case manager, Nursing in Charge, Clinical Nurse, Nurse Administrator, Nurse anaesthetist, Nurse Educator, AID’s Care Nurse, Genetics Nurse, Cardiac Rehabilitation Nurse, Intravenous Therapy Nurse, Occupational Health Nurse, Correctional Nurse, Nephrology Nurse, Neuroscience Nurse, Trauma nurse, Forensic nurse, Flight Nurse, Holistic Nurse, Military nurse etc.
So you can take up nursing as a career