Hello Sarthak,

You cannot take the MCAT during the MBBS, its an exam and not a course. Opting for the USMLE after the MBBS would be a better option.

The earnings will depend on the college you graduate from, and your specialisation. But the USMLE is a license to practise as a doctor, and MCAT is the exam to get educated as a doctor. You have to take both together to start earning.