Hello

There's nothing like lateral entry for mbbs

So , even though you have completed your bsc and you want to do mbbs ,
you will still have to spend 5.5 years for mbbs and take the usual route of qualifying neet examination to get into medical colleges for your mbbs as there's no scheme of lateral entry or something similar to it for mbbs.
One good thing is that there's no age limit for neet so you are eligible for it provided you have got at least 50% marks taken together in PCB in your class 12th board examination if you belong to general category ; while it's only 40% aggregate in pcb for obc, sc and st categories , so after clearing neet you can do mbbs

Thankyou