Hello Anubhab, 

Linking marks to rank is a very hard job because it varies hugely year to year. Ranking being a better predictor. A state rank within 200 can be taken as a safe minimum for admission to Kolkata Medical College. Now correlating NEET AIQ with State is yet another impossible job as of now.

For instance of marks,you may take 550+ as the minimum although I do not have any documentary analysis and proof to support it. It’s all I learned from personal experience.