I am expecting 642 marks in neet 2019 (general catg),can i get any college in delhi through all india quota ??

Hello student,
Yes, With a score of 642 in general category, you have chances of procuring a seat in the government medical colleges when comparing the results of previous years. Last year, a score of 612 got a seat in NDMC medical college, Delhi on general category under the state quota. But one thing to keep in mind is that scores and ranks vary each year with difficulty level of the question paper and availability of seats. However you can predict the colleges which you are likely to get using the given link
http://medicine.careers360.com/neet-college-predictor
Good luck