Do most MBBS graduates somehow manage to clear NEET PG and become MD?

I have heard it is incredibly difficult. But I've also heard that plain MBBS is not very valuable, you also need to do MD. I have also not seen many plain MBBS doctors either. So what happens? You grind your ass and finally manage to clear NEET PG then? Is it easy then? Basically I want to know, do most MBBS grads end up doing MD or do most fail to do it?