Hello

You don't  need to worry  if you are interested in studying  MBBS , you can still go for MBBS even after your BSc provided you must have passed in English and in both the theory and practical of PCB i.e Physics, Chemistry and Biology with at least 50  % in aggregate of PCB ( in theory +practical) in 12th examination if you belong to general category , or  at least 40% in aggregate of PCB if belongs to Obc/ Sc /st.
If you fulfil  this , then you can appear in NEET examination which is the entrance examination for MBBS and if you managed  to qualify  it then you can get a seat for mbbs in a Medical College

For detailed information about neet examination go through our page for which link is provided below; -

https://medicine.careers360.com/articles/neet/amp

Thank you