Hello Rakesh

You will be allowed to pursue degree in economics on the basis of your class xii marks.

Eligibility for pursuing degree in economics is that you have passed class xii with minimum 50% marks from any recognized university from any stream.

But as you have mentioned that you are mbbs graduate but you want to go with economics  then you can pursue bsc in economics

Eligibility for bsc economics - The candidate must be xii pass from a reputed university. You can also do BE in economics  or B.com in economics.

. Mbbs is a medical course , you can go for economics only if you have strong base in economics and interest in it.

To know more kindly refer to following link

https://www.careers360.com/courses/be-bachelor-of-economics