If you belong to General category, then it would be quite difficult to get any government Medical college as the cutoffs lies around 590 to 600 marks and dental its around 550 marks. Now if you belong to any reserved category then you expect few Medical colleges through All India quota.

However you can try for State counselling. Your profile shows that you belong to Madhya Pradesh, so with 420 marks In Neet for general category candidate it would be difficult to getw government Medical college but you can go for private Medical colleges as they participate in State counselling. To get complete list of colleges that you can get based on your rank use this link http://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer