Hey,

USMLE is an international exam which helps one to practice as a medical expert in USA. The exam comprises of three levels out of which two levels can be cleared in your hone country but it's mandatory to go give the level 3 exam in the USA.

The eligibility to apply for level 1 and level 2 is same and that is a student needs to be enrolled in an undergraduate medical course outside of USA as well as Canada.

So as far as your question is concerned you can't sit for USMLE soon after NEET exam. First you get enrolled then you prepare for a while and then appear for the examination.

Below I have attached a link that contains detailed information about the exam and it's eligibility criteria.

https://www.google.com/amp/s/studyabroad.careers360.com/articles/usmle-eligibility-criteria/amp

Hope that helps.

All the best

Thank you