Hey,

In order to become Cardiac surgeon you need to first appear in  NEET UG exam.

After clearing this exam you will be given admission into a MBBS college which is of almost 5.5 years ( 4.5 study + 1 year internship) .

After completing your MBBS you need to sit for NEET PG  exam and after the qualifying the exam you will be alloted your specialization as per the rank you get in the exam.

Hope that helps.

Thank you.