Students from AIIMS, as well as State Colleges, prepare for USMLE. Medical colleges don’t help you with USMLE preparation, you have to work for it yourself.
But it does help to have batchmates and seniors who are preparing for the same. Also, a good record in extracurricular activities and research work will make for a strong application.
AIIMS Patna and AIIMS Nagpur, both have candidates preparing for their USMLE. However, AIIMS Patna was established in 2012, while AIIMS Nagpur, in 2018. Therefore, AIIMS Patna allows for more exposure and networking opportunities with seniors and alumni as compared to AIIMS Nagpur. Professors at AIIMS Patna are very encouraging in terms of research work participation by the students, and from the Batch 2020, students have to perform, in their 3rd or 4th year, one compulsory project.
Thus, AIIMS Patna has a few advantages over AIIMS Nagpur in USMLE preparation. However, at the end of the day, individual efforts and dedication are what matter the most.
It really does not matter which institute you do your medical graduation from until and unless you become an international medical graduate. That is all that US officials care about.
You can also opt for getting into state colleges like KGMU or Seth GSMC where you can be surrounded by other USMLE aspirants.