Assuming youre a General Category Student, you must target atleast between 550+/720 for prospects securing a seat in some of the Good Goverment Medical Colleges. However, today you even have many good State and Private Medical Colleges at lower Score. But this wont lead you to become a Cardiologist.

After MBBS, you need to pursue Postgraduation/Specialization M.Ch/MS/DNB in Cardiology, for being a Cardiologist in future.

For more information about Career of a Cardiologist do follow the link below

https://www.careers360.com/careers/cardiologist