Please score as much as you can. The cutoff can be be really unpredictable. 

Best of luck. 

I can help you with the rank range as in per previous year cut off for round 1 was -

Maulana Azad Medical College, New Delhi - 29710

University College of Medical Sciences, University of Delhi, Delhi - 41223

Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi - 40588

So tentatively better to get 450+ so that you can easily get admission in your desired college.

Good Luck!!!