Dear Reddy, MBBS and B.Sc Nursing are 2 different courses of the medical stream. MBBS is a 5 & 1/2 year duration course which includes 1 year of mandatory rotation internship. If you are talking about MBBS duration after B.Sc Nursing, there is no lateral entry. You still have to appear for NEET and qualify. Then you will be admitted as a regular MBBS student into 1st year. Hope this helps!