Dear Ritu, you haven't  mentioned which Category you belong to. Neverthless, in 2018 under State Quota, the cut offs for IGMC have been as follows:

General Category: 583

SC: 539

ST: 434

Now this is 2018 data and in 2019, the general cut offs increased by 15 marks and individually for each college, the cut offs increased by 75 marks on average. And cut offs depend on various factors such as no.of candidates appearing for the exam, no.of candidates qualified, top NEET score and difficulty of the exam. Based on all this and your Category, you should alteast aim for 100-125 marks more than 2018 data.