USMLE

USMLE is not valid in India to directly practice as a doctor. Even if you pass USMLE, you cannot work in India unless you also clear NEXT or other Indian medical exams. But if you finish your residency in the USA, you can come back and work in India after registering with the NMC (National Medical Commission). So USMLE is for the USA, not a replacement for NEET PG or FMGE in India.

Yes, you can give USMLE after MBBS. In fact, many students start preparing for it during MBBS or internship. Once you finish MBBS from a recognised medical college, you can apply for the exam. So yes, after MBBS is a good time to give USMLE if you want to go to the USA for PG.

Yes, many students say that USMLE is harder than NEET, especially for Indian students. NEET mostly checks your memory and basic understanding. But USMLE is more about concepts, clinical thinking, and applying knowledge in real-life patient cases. Also, it is in English, and the question style is different. So, yes, it feels more tough, but it's not impossible.