Hey,

With 640-650 marks, you will get a rank between 946-1714. You can check it here https://medicine.careers360.com/articles/neet-result-marks-vs-rank

Since you did not mention your category, I am assuming you are of general category.

Based on previous year cut off, you have a decent chance of getting SMS Medical College, Jaipur as last year it closed at a marks of 641. To know more about Rajasthan cut off, check here https://medicine.careers360.com/articles/neet-cutoff-rajasthan

To get a list of colleges in which you have a chance of getting MBBS/BDS seat, you can use NEET College Predictor https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer