Hello

641 is a  really good score and as per the marks, you have decent chances of admission in Institute of Medical Sciences Banaras Hindu University, Varanasi. Also, you have chances to get a seat in other top medical colleges such as King George Medical University, Lucknow, Seth GS Medical College, Mumbai through All India Counseling. 

You can also use the College Predictor Tool

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https://medicine.careers360.com/neet-college-predictor