Hi

You have not mentioned the category you belong to so I am  assuming  you from general category if you belong to any other category then do let me know in comment .

In neet 2019, 506 marks was the lowest marks that was required for general  category for getting a seat in a medical under West Bengal  State quota and it was for SHRI RAMKRISHNA INSTITUTE OF MEDICAL SCIENCES AND SANAKA HOSPITALS

You can check the same at

https://medicine.careers360.com/articles/neet-cutoff-west-bengal

But cut off marks  keeps changing every year depending upon various factors like number of students that appeared in the exam, kind of marks obtained by them , toughness level of the examination etc.

So , you should try to get at least 550 marks in your neet 2020 examination  to be on the safer side

Thankyou