Aditya, we do not have 2019 cut offs yet. And, you haven't mentioned your Category. Neverthless, the cut offs for both the Colleges under All India Quota for various Categories have been as follows:

Seth GS                              Grant Medical College

General Category:                      634                                             607

SC:                                                 541                                             512

ST:                                                 465                                             475

Now, as mentioned, this is 2018 data and cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam. Now in 2019, the general cut offs increased bu 60-75 marks.Considering all these facts, you should atleast try to score more than 75-80 marks mentioned here against your Category.